局部通风机及其启动装置应安设在进风巷道中，地点距回风口（）m以上，且支护完好、无淋水、无积水、无杂物。
A.5
B.10
C.15
D.20
参考答案：B
The earthquake which happened in YuShu _____ 14th April 2010 was a big disaster. [ ]
A. at
B. on
C. in
D. to
术附汤1功效与作用
