Supper ____________ ready.[ ]
A. am
B. is
C. are
答案:B
Let’s ________ together. [ ]
A. go to home
B. to go to home
C. go home
D. to go home
ZZ5200/19.5/42型支撑掩护式液压支架适用于()煤层工作面。
A、煤层厚度3-5m
B、倾角不大于15°
C、中等稳定顶板
D、底板平整
E、顶板稳定