问题
选择题
| The crazy fans _____ patiently for two hours, and they would wait till the movie star arrived. |
A. were waiting B. had been waiting C. had waited D. would wait |
答案
答案：B
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| The crazy fans _____ patiently for two hours, and they would wait till the movie star arrived. |
A. were waiting B. had been waiting C. had waited D. would wait |
答案：B
的c点有一固定绳圈。若绳圈上悬挂质量为m2的钩码，平衡后绳的ac段正好水平，则重物和钩码的质量比
为
