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请根据不同的实验内容回答对应的问题。 实验内容 回答问题 ⑴测定空气的成分 ①该实验可得出：空气中氧气体积分数约为 。 ②写出红磷发生燃烧反应的化学方程式 。 ⑵探究二氧化碳的性质 ③该实验过程中，可观察到的现象是 。 ④从实验现象得出，二氧化碳具有的性质是 。 ⑶电解水 ⑤从该实验中得出的正确结论有 （填字母序号）。 A．氢和氧两种元素组成 B．电解水产生的氢气和氧气的体积比约为2﹕1 C．一个水分子由二个氢原子和一个氧原子构成 D．化学反应中，分子可以再分，原子不能再分
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举一反三
【单选题】分推膻中的具体操作,是下列哪一项( )
A.
中指揉膻中
B.
两拇指至穴中向两旁分推至乳头，又称开胸
C.
用食，中，无名指沿胸骨上下摩擦
D.
用食，中指至胸骨切迹向下推至剑突
【单选题】听力原文：M: I think the hostess really went out of her way to make the party a success. W: Yes, the food and drinks were great, but if only we had known a few of the other guests. Q: What did the two spea...
A.
They enjoyed the party better than the other guests.
B.
They knew none of the other guests at the party.
C.
They didn't think much of the f6od and drinks
D.
They went a long way to attend the party.
【单选题】I'm ____ that getting into university is not the only way to success.
A.
ware
B.
aware
C.
wear
D.
await
【单选题】分推膻中的具体操作是下列哪一项（ ）
A.
用食、中、无名指沿胸骨上下摩擦
B.
中指揉膻中
C.
两拇指自穴中向两旁分推至乳头，又称开胸
D.
用食中指自胸骨切迹向下推至剑突
【单选题】—What a mistake! —Yes. I ______ he do it in another way, but without success.
A.
was suggesting
B.
have suggested
C.
would suggest
D.
had suggested
【单选题】分推膻中的具体操作是下列哪一项（）
A.
中指揉膻中
B.
两拇指自穴中向两旁分推至乳头，又称开胸
C.
用食中指自胸骨切迹向下推至剑突
D.
用食、中、无名指沿胸骨上下摩擦
【单选题】听力原文：M: I think the hostess really went out of her way to make the party a success. W: Yes. The food and drinks were great. But if only we had known a few of the other guests. Q: What did the two spea...
A.
They enjoyed the party better than the other guests,
B.
They knew none of the other guests at the party.
C.
They didn't think much of the food and drinks.
D.
They went a long way to attend the party.
【单选题】—What a mistake! —Yes. I ________ his doing it another way,but with out success. [ ]
A.
was suggesting
B.
will suggest
C.
would suggest
D.
had suggested
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