【題組】丙收集完氧氣後要如何放置於桌面上，又其原因為何?(A)倒放於桌面，因氧氣的密度小於空氣　 (B)正放於桌面，因氧氣的密度大於空氣　(C)正放於桌面，因氧氣難溶於水　 (D)正放或倒放皆可

問題詳情

21.丙收集完氧氣後要如何放置於桌面上，又其原因為何?
(A)倒放於桌面，因氧氣的密度小於空氣　
(B)正放於桌面，因氧氣的密度大於空氣　
(C)正放於桌面，因氧氣難溶於水　
(D)正放或倒放皆可，不會有任何影響。

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增

內容推薦

【題組】What is right?(A) Tomozou is smart. (B) Maruko is from Taiwan.(C) Tamachan isn’t a good stud
Paul: I am a doctor from the USA. And you?Brian: I am an actor. And I am from the UK.(A) Brian i
A: Look! That’s our bus! Let’s hurry.B: Don’t run so fast (快速地).(A) Let’s stand up.
A: Your English is so good. B: My mother is from the USA.A: __________(A) How come? (B) By the w
The Thinker: Please __________ nice to me.The students: Wow! It is talking (正在講話).(A) be (B) am
A: Hey! That’s my lunch, not your lunch. B: Oops! __________.(A) No, it’s not. (B) I’m sorry. (C
A: __________ is the beautiful girl over there? She is so thin.B: She is my brother’s classmate,
A: are you, boy? Five? B: No, I’m six.(A) How old (B) What (C) How (D) Where
A: is Mr. Koothrappali from? B: India.(A) How (B) What (C) Where (D) Who
A: Look. The leaves are red.B: Yes, they are beautiful. They are __________.(A) maple leaves (B)

內容推薦