Squall lines most often develop _______ .
A.in an occluded front
B.in a cold air mass
C.ahead of a cold front
D.behind a stationary front
正确答案是C
Squall lines most often develop _______ .
A.in an occluded front
B.in a cold air mass
C.ahead of a cold front
D.behind a stationary front
正确答案是C