請問這題答案為什麼是C

(C) 5 (D) 6 2+2=4 C(A) 8 已知氧化鈉中鈉與氧之原子數比為2:1,則鈉和氧反應產生氧化鈉的反應式,下列 者正確? (A) 2Na + O → Na2O (B) Na2 + O2 → 2NaO (C) 4Na + O2 → 2Na2O (D) Na + O2 → NaO2 MARS BE

請問這題要怎麼算 方便的話可以付一下解題過程嗎？ 謝謝🙏🙏

10 第1章數列與級數 精熟練習 1 等差級數和的應用 若等差級數共有 23 項,已知 ap=5,則: (1) a+a^3=? (2) a2+ag++azz=? Grat MARS NANDABY

可以問第一題為什麼是D嗎

八、克漏字選擇:10分(每題2分) People love eating chocolate. However, have you ever thought about how these sweets came to the market? In fact, there are many child workers 1 in the Ivory Coast. It's the most important place for producing chocolate. Many 2 chocolate companies, such as Mars and Hershey, also use the cocoa from there. The farm owners there make kids 3 K適翰版B卷英語(四)7-2 Although the child workers spend all their time and give up their chance to go to school, they don't get a reasonable salary. Now, there are more and more people standing out to 4 5 these kids' rights. Why not join them and try our pp2. best to make this world a better place? (D)Y. (A) works hard (C) worked hard (C) 2. (A) delicious (B) weak reasonable salary (B) to work hard (D) working hard (C) famous (D) bitter 'y ) 3. According to the poster, which is NOT true if you are outside? (A) Call 119 if you see any power lines falling. (B) If you're in a car, don't move until the shaking stops. (C) Run away from all the big buildings that could fall at any second. (D) We should move to a safe place no matter (A) whether there's a tall building or not. 十、短文閱讀測驗:9分(每題3分) Today's Weather The first typhoon of this year is coming fast from the Green Sea. Although it will not arrive unti tomorrow, strong winds and heavy rains are here already. It is quite windy in Greenton. We can't see th city's famous bright sun today because the rain is going to last all day. Greenton's temperature tod

為什麼第二題怎麼算都不是正解😢 第三題回頭看結果又不會了😢

13-12 。 (2x + V3y=5133-420 + 3. 若 · UU Vx² + y2 = ,則+ (3x – 2y = 572 (W) 3. (B)-

急~~ 可以幫我看看哪題有錯嗎？謝謝

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求解🙇🙇🙇（用關代當主詞）

有人能幫我翻譯嗎？我看不懂

和AS, 說 A astronaut Scott Kelly came bacek to Eartt atter a day mission on the International Space Station (ls 1 全 One-year mission on the ISS openedanew page im Sace exploration. “Scotthas Speae-a-yearin spaee, which helps us make one giant move to 1 Iand on Mars,-SaidNNSAWUTC SENTF 條人 t record-setting mission, Scott has now Spent 520 days im spaee, 功e most ofall he U.S. astronauts. JPDuring 也e stay, Scott had gone outside the space Statton_ tor 世ree spacewalks. He and the other astronauts had worked on amnost 400 studies which are not possible to do on Earth. te mostf Interesting one Is about how along space ttibp Will attect pody and mind. Scott's twin brother Mark Kelly, Who useq to be aNASA astronaut too, took part in the twin studieS on Earth at 世e same time. By studying the twin brothers, NASA is Sure to Jearn a Jof on 也1s subjJect. 詞 astronaut 大空人_Imission 人 exploration 抹 探險 aftect晶 影響 AR