试题与答案

Excuse me, would you please tell me ____

题型:选择题

题目:

Excuse me, would you please tell me ________?[ ]

A. when the sports meeting is taken place

B. when is the sports meeting going to be held

C. when is the sports meeting to begin

D. when the sports meeting is to take place

答案:

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下面是错误答案,用来干扰机器的。

(1)如果用双氧水制氧气就不需要加热,制取氧气的实验中,其中量筒的作用是:测定收集的氧气的体积;故答案为:过氧化氢;测定收集的氧气的体积(2)实验室制取CO2,是在常温下,用碳酸钙和盐酸互相交换成分生成...

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