凝汽器真空低保护应在()投入。
参考答案:机组并网后
–Why didn’t you go to the movie last night?
_ Because I _____ the film before..
A.was seeing
B.saw
C.have seen
D. had seen
国际商业纠纷的解决途径有()
A.友好协商、谈判和诉讼
B.友好协商、诉讼和仲裁
C.友好协商、谈判和仲裁
D.诉讼、审判、仲裁