单项选择题 听力原文：W: What do you think of the apple pie? I made it myself.M: My mother cannot match you.What does the man mean?A．His mother can't make apple pies.B．His mother likes the pie very much.C．This pie can't match his mother's.D．This apple pie tastes very good.

多项选择题 对于高强混凝土的叙述，错误的是（）。

单项选择题 矿山安全技术本部分共10小题，每小题1分。每题的备选项中只有一个最符合题意。下列主要用于立井井筒、运输大巷及井底车场所采用的主要支护方式是( )。