正常情况下胸部MRI不能显示的结构是（）
A.胸腺
B.皮肤
C.胸膜
D.气管
E.食管
参考答案：C
I can't _____ any good advice to give her. [ ]
A. think for
B. think of
C. think up
D. think over
釆空区瓦斯抽放钻孔深度为（）。
A.130～160m
B.130～150m
C.150～250m
