"前有狼,后有虎",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
参考答案:B
We are late for school ____the heavy snow .
A,because B, because of C, as
简述地震勘探基本上分为三个环节?