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【判断题】
机会成本是指投资者将有限的投资投入拟实施的技术方案而放弃了其他投资所获得的最小效益。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】民用建筑一般分为( )和( )。
【单选题】The whole book contains 13 units, ______ three mainly revisions.
A.
to include
B.
being included
C.
included
D.
including
【简答题】完成实验报告电子档 实验十三 数组和常用函数的使用 .docx
【单选题】My pain _______ apparent the moment I walked into the room, for the first man I met asked sympathetically， “Are you feeling all right?”
A.
must be
B.
must have been
C.
should have been
D.
could have been
【单选题】My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: 'Are you all right?'
A.
must be
B.
had been
C.
must have been
D.
had to be
【单选题】Three “-ings” include the following except .
A.
Betting
B.
Drinking
C.
Tipping
D.
Bargaining
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