靠近零线的那个极限偏差一定是基本偏差。( )
参考答案:错
瘢痕疙瘩常好发的部位是
A.眼睑
B.手掌
C.胸骨柄
D.足跖
E.外生殖器
The ground isn't wet. It ________ have rained last night.
A.mustn’t
B.shouldn’t
C.wouldn’t
D.can’t