问题
选择题
Do you know when _____ ? [ ]
A. he comes
B. will he come
C. he will come
D. does he come
答案
答案：C
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Do you know when _____ ? [ ]
A. he comes
B. will he come
C. he will come
D. does he come
答案：C
B + C↑ 中，D为固体催化剂，将A、D的固体混合物l0g放入试管中加热到A完全分解为止，冷却后称量所得固体物质的质量为7g，则反应中[ ]