因溃疡行胃大部切除术,一般应切除的胃容积为()
A.30%~40%
B.60%~70%
C.40%~50%
D.70%~80%
E.50%~60%
参考答案:E
-Listen, there is some strange noise. This machine must be________.
-I think so. You must have it checked.[ ]
A.out of order
B.out of date
C.out of sight
D.out of control
焊接工艺评定试件所进行的力学性能试验和弯曲试验如果不合格是否可以复验?