有()的采掘工作面,必须有专人经常检查,并安设甲烷断电仪
A.突水危脸
B.煤与瓦斯突出危险
C.瓦斯喷出危险
D.瓦斯涌出大、变化异常
参考答案:B, C, D
----- Do you play _________ piano in your free time?
----- No, I like sports. I often play ________ soccer with my classmates.
A./; the
B.the; /
C.the; the
D.a; a
原始凭证应由( )审核。
A.销售人员B.会计机构、会计人员C.采购人员D.经办人员