手术后粘连性肠梗阻和麻痹性肠梗阻鉴别，错误的是A．前者发生在术后早期(3～4天)，后

The two plans sound good. But Dad won't approve ______  of them,for they are not practical. [ ]

A. any            

B. both            

C. each        

D. either

How is the weather like().

A.Good enough for outing.

B.Bad.

C.Not as good as it was a while ago.

D.It’s getting better.

对压铸而言，下列说法正确的是（）

A.可浇厚大件

B.铸件可通过热处理来提高强度

C.可浇高熔点合金

D.铸件不能热处理

用库仑法测硫过程中，空气流量应达到（）ml/min。

A.800

B.1000

C.1500

电火花加工过程中应严禁触碰工件及工具电极，防止触电。