【判断题】在房室交界处传导速度缓慢,需时较长,称为房室延搁。
【单选题】平衡运输模型的约束方程的特点包括
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。
【单选题】Although Jim had expected something special from Della, he was still surprised by _____ he saw. [ ]
【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.
【单选题】转炉吹炼中、高磷铁水时,选择( )是经济合理的。
【判断题】兴奋由窦房结传至心室时,在房室交界处传导速度缓慢,需时较长,称为房室延搁。
【单选题】转炉吹炼中、高磷铁水时,选择( )是经济合理的。