每钻进()米及见可采煤层底板后,需丈量钻具全长,以校正钻孔深度。
A、30
B、50
C、100
D、150
参考答案:C
下列哪些节日的由来与中国近现代史上发生的重大事件有关
①端午节②青年节③建军节④国庆节 [ ]
A、①②③
B、②③④
C、①③④
D、①②④
He asked me__________with me.
A.what the matter is
B.what the matter was
C.what is the matter
D.what was the matter