煤气区域划分为()。
A.甲、乙两类危险区
B.甲、乙、丙三类危险区
C.未进行划分
参考答案:B
" What's the matter ____________ you? " the doctor asked.[ ]
A. from
B. with
C. for
D. at
“鱼与熊掌不可兼得”,这种动机冲突是()
A.双趋冲突
B.双避冲突
C.趋避冲突
D.双重趋避冲突
E.双趋双避冲突