问题
多项选择题
根据围岩与煤层的相对位置,可将煤层顶板分为()。
A、直接顶
B、假顶
C、伪顶
D、基本顶
E、人工假顶
答案
参考答案:A, C, D
根据围岩与煤层的相对位置,可将煤层顶板分为()。
A、直接顶
B、假顶
C、伪顶
D、基本顶
E、人工假顶
参考答案:A, C, D
根据对话内容,从方框内的选项中选出能填入空白处的最佳选项,其中有两个为多余选项。 (Mary Hand—M;Chen Hui—C) M: Help yourself to some chocolates. Chen Li brought them from Shanghai. C: 小题1: I can’t eat anything sweet. It’s my teeth. M: I’m sorry to hear that. 小题2: C: I did. He told me that I have to have one tooth out and two filled. But I can’t find time for it. M: 小题3: C: But I’m busy now. I think I’ll go next week. M: I’m afraid you’d better go right now. The sooner you do something about it, the better. C: 小题4: Can you please tell our head that I’ll be back by lunchtime? M: 小题5: C: Thank you very much. See you this afternoon. M: See you.
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