錾削槽时必须采用斜角起錾。( )
参考答案:错
绒毛膜癌最常转移的部位是()
A.肺
B.脑
C.骨
D.肝
E.肾上腺
表达式Left("how are you",3)的值是
A.how
B.are
C.you
D.how are you