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【简答题】
钢管连接方法有（）、焊接、沟槽管箍连接以及法兰连接四种。
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反馈参考答案：
举一反三
【单选题】平衡运输模型的约束方程的特点包括
A.
约束左边所有的系数都是0或1
B.
运输问题约束方程左边的每一列中恰有两个系数是1,其他都是0。
C.
有m+n-1个独立约束条件,该问题的基变量有m+n-1个。
D.
以上都正确
【单选题】Although Jim had expected something special from Della, he was still surprised by _____ he saw. [ ]
A.
what
B.
which
C.
that
D.
How
【简答题】挑选,采摘 V.
【单选题】Which of the following sentences is the meaning of"Tom was to have gone to New York but he had something urgent to deal with"?
A.
Tom would go to New York but he had something urgent to deal with.
B.
Tom had intended to go to New York but he had something urgent to deal with.
C.
Tom was going to New York but he had something urgent to deal with.
D.
Tom had gone to New York but he had something urgent to deal with.
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