汞合金成分里哪一种成分的加入能减少合金中的γ2相
A.银
B.锡
C.铜
D.汞
E.锌
参考答案:C
There was a lot of fun at yesterday's party. You ________ come,and what a pity!
A.might have
B.should have
C.could have
D.would have
液化气贮罐、槽车的安全灌装量,按容积计算,一般规定在()℃灌进,灌装量不超过容积的85%。
A、45
B、40
C、35
D、30