問個 為什麼氣泡會往上浮啊？氣泡的蒸氣壓造成的力不是四面皆同嗎 那它為什麼會往上浮？

三、沸騰 定義:1.當液體在容器中被加熱,通常在容器底部加熱處形成氣泡(bubbles),當溫度 到達某一程度,蒸氣氣泡形成,經由底部上升至液面破裂,此時,我們說此液 體正在沸騰(boiling) 。 2. 液體沸騰的溫度決定於作用其上的壓力,如下圖所示。對於一個氣泡而言,為了 溫度處於能形成和長大,其內之壓力P,至少須等於P,而後才能上升接近液面,不過, 弗腾. 簡直是液體的蒸氣壓,所以我們得結論:當液體的溫度處於其蒸氣壓等於作用於 其液面的外壓時,此液體就可沸騰。壓力1atm(即101.3kPa)時,液體沸騰的 溫度,稱為正常沸點(normal boiling point),例如,水的正常沸點是100℃,而 苯的正常沸點則稍低,80℃。水的正常沸點100℃ 表示水在100℃時之蒸氣壓 為760 torr;酒精的正常沸點 78.4℃表示乙醇在78.4°C時之蒸氣壓為 760 torr; 二乙醚的正常沸點34.6℃表示二乙醚在34.6℃時之蒸氣壓為760 torr。 S P2 每單位面積上的大氣壓力 液面 液面 ·液體的氣泡 蒸氣分子撞 頸蒸 三 擊氣泡界面 意識器容空氣泡- 而向外推壓 a 蔬果 Pi 高炎 (a) ④當P大於P時,液體沸騰,氣泡由底部上升至液面,氣泡的壓力至少要等於 外壓,才能存在。 大氣壓力經液體向氣泡推壓 (b)

為什麼極限不存在（圈起來的部分）

由左、右極限求極限值 直觀地說,必須左、右極限都存在且相等才有極限值。 (x)\_coil (8) 範例 1.設y=f(x)圖形如右,回答下列問題: (1) lim f(x) = x→]- (2) lim f(x) = x→2 2, + limf(x)= 2, lim fa limf(x) = lim f(x) = 4 x-3- , x→1+ lin f(x)=1 lim f(x) = x→3+ limf(x)= 2。 X lim f(x) =__X) • limf(x) = , O 5 EART 3 [a) = g(2 2 3 小小叮嚀 用心感受左、右極限的估

求解！

3 12 設不等式 ax2-2ax+2a-3<0之解為-1<x<3,試求實數a= ax-2ax+ (20-3) <0 (X+1)(x-3) <0 ⇒x=2x-3 <0 447 ** 3 36-173 OIL 47 h X<- x < -2 or Mir

這題要如何用它給的提示解？ 為什麼我把全部列出來答案卻多那麼多？

位為 6. 以汽笛的長音、短音來做信號,長音一次需2秒,短音一次需1秒,每音之間有1 秒的間隔。若每一組信號前後的總長度為 15 秒,則能做成 種信號。 信號 10/0/0/0/0/0/0/ CASION 1 ²/²/²/² = 7 ?? 61 14 AN AD U = 2! 5!2! = X5 =20 0/0 0% onom 6 3!3! = 6! MOTOIL 3 300 DU U 4!2! r 事 原來如此 設長音x個,短音y個,則有 (x+y-1)個間隔。這是歷史 悠久的聯考題

圈起來那個部分（圖一）為什麼啊 是這樣嗎？（圖二）

範例 導線旋轉所生的電動勢 6 有一以O為圓心､L為半徑的 OMN 扇形電路置於均勻磁 場B中如右圖所示,磁場垂直穿入紙面,半徑 OM 之間 20 有電阻R,電路中其他電阻可忽略不計。OM與MP弧固 定不動,而長度為 L 的 ON 以O為軸心作順時針往P方 向旋轉,角速率為①,則電路中電流為下列何者? @BL2 ①BL² o BL² 2R R 2R/ (A) 【答】 T= V= (B) R 2 二 M (C) 解題關鍵▶利用動生電動勢:=(vxB) (=vBC,其中7L00 E VBL HASUE R BLW 2 R ①BL R (D) 點,均勻限 ETTEN MOR (E) @o²BL² 2 R² DO 美宝固縣(日光 ABA HUAy VI 3-3 法拉第電磁感應定律 135 。 (C) OILIGES AST ab s M 相關題型:單元練習 7. MIN 為平均(切割)速率。 x AC 時則琳一現bods 套間空,示调 x X x 【102指考】 答對率 37% 全网。 x X P (0) A8 (8) O(A) 杂曲歌,更是採hvBC)、

想問這幾題 想問為什麼錯的不能用+對的為什麼能這樣用？🙏

英文考科 二、綜合測驗(占10分) +3 on 說明:第11.題至第20.題,每題1分。 bodzowbred no 第11.至15.題為題組 In 1956, African honeybees were introduced into Brazil to improve honey production in the tropical climate of South America. However, they started to mix with European honeybees already living there and produced a new kind of "Africanized" honeybees that are better at setting up hiyes and at reproducing than European bees. Keeping Africanized bees poses a challenge to beekeepers. Generally, beekeepers keep their bees in 11. wooden boxes, or hives. s. Afte After the worker bees fill a hive with honey, the beekeepers open the lid of the hive and blow a few puffs of thick, cool smoke into the hive to help calm 12. easier to collect the honey. the bees, 第 2 頁 共 10 頁 The problem with keeping Africanized bees is that they are more defensive than European bees. Even the slightest bump against the hive may 13. an alarm. A large quantity of smoke is needed to calm the bees. Two or three beekeepers may need to work together to safely harvest the honey. And they may need to wear heavier beekeeping suits even in hot, 14. weather. Beekeepers may also collect less honey from Africanized bee hives. European bees form search parties and work together to collect flower nectar from which honey is made, while Africanized bees usually work alone in search of flowers. Therefore, less nectar is brought back to Africanized bee hives. Africanized bees also spend less time storing honey but more time caring for young bees. That may be because they 15. in a tropical climate where not much honey is needed for food during the winter. (C) starved AB 11. (A) stacked door Lyc (B) stuffed obl (A) which make them (B) so that they are (C) thus it would be D (B) go off (C) call off (A) get off (D) staffed (D) making it DLL CC

問c 可是rna不是在細胞質也有嗎 那這樣高基氏體表面為什麼不會也有一些rna？

19圖9為三種細胞膜狀胞器的示意圖,下列敘述何者正確? (A)均為能量轉換胞器 ((B)均存在於酵母菌細胞 OILO ※ (C)加入 RNA 水解酶後均會有水解反應發生 (D)均可在構造上觀察到轉譯作用的進行 (E)均可形成囊泡參與細胞內物質的運輸 Cozs 果、瓜米、菜 AMARANTENS 期 8 圖9 (d1=0S1=2 【答對率31%】

B選項是因為接觸面積的關係嗎

CEB. 刀 I Fil DAR itt. A Fift 4. 一大塊結晶蔗糖稱重後置於 250 毫升的燒杯A中,等量小結晶 蔗糖置於 250 毫升的燒杯B中,如下圖。每個燒杯中加入100 毫升水後覆蓋一錶玻璃,最後達溶解平衡時,燒杯 A、B均有 糖晶剩餘,有關此兩個溶解平衡,下列何項敘述正確? (A)在A燒杯中未溶解之糖較多(B)在B燒杯中糖之溶解速率大於A燒杯中糖之溶解速 率 (C)兩燒杯中均有糖之溶解及結晶持續發生 (D)欲增大燒杯A中糖的溶解度,可再加 入更多固體糖 (E)將燒杯B加熱並保持較高溫度,可增大糖水之濃度。 1. toil whe A 30 B A B 10 0 10 20 30 40 50 60 70 溫度(℃)

第24題為什麼選c

Ar 20. (A) into 第21 至 25 題為題組 Hair usually gets greasy when it has not been washed because it soaks up oil-hence the need for shampoo! 21 this oil-absorbing feature might not always be so great for our hygiene, it can be great for the environment. (A) equipment Matter of Trust, a nonprofit organization, has an innovative solution for removing the large-scale oil 10 26 spill in the Gulf of Mexico in 2010, using the ultimate renewable 22 human hair, of which there is an unlimited supply. Since its founding in 1998, Matter of Trust has collected donations of human hair and animal fur to 23 the thousands of oil spills that happen each year. The hair and fur are made into mats and brooms and sent to 24 waters to absorb the oil. √2B (A). №24. (B) without Across the United States each day, 300,000 pounds of hair and fur are cut. Matter of Trust is helping organize the collection of this 25 hair and fur through thousands of salons, pet groomers, and ranchers. Individuals can also speak to local hair stylists and pet groomers about sending in leftover hair and fur. 21. (A) For B (B) While (C) In case (D) As long as (C) product (B) ingredient (B) clean up after (D) resource 鄙視 (D) look down upon (C) run out of (B) polluting (C) polluted (D) pollution (B) overthrown (C) excluded (D) disconnected get away with (C) under 24. (A) pollute (D) beyond 25. (A) unneeded T - 2 -

急❗️❗️請問這題的c為什麼不行🥺🥺🙏🙏

希沸點時 液體蒸氣壓大小:甲乙丙(E)若是純溶劑,則甲、乙液可能是 nin. 添加非揮發性溶質至丙溶劑的溶液。 BODE 28.下列何種措施可以使物系的蒸氣壓下降?(A)水中加入乙醇 (B)水中加入尿素 (C)水中 加入木炭 (D)把水溫降低 (E)水中加入蔗糖。 Dimag Osogle oilmal. 大突6本民去