题目内容

混凝土运输、浇筑及间歇的全部时间不允许超过()

A. 混凝土的初凝时间
B. 混凝土的终凝时间
C. 终凝时间或初凝时间
D. 混凝土的搅拌时间

查看答案
更多问题

Many workers were organized to clear away remained of the World Trade Center.()

A. those
B. that
C. what
D. where

有两个实体集,并且它们之间存在着一个M∶N联系,根据概念ER模型转换成关系数据库的规则,这个ER结构转换成表的个数为()

A. 1
B. 2
C. 3
D. 4

The organization broke no rules, but ______had it acted responsibly.

A. neither
B. so
C. either
D. both

_____ of water makes Death Valley a desert, but it is by no means devoid.

A. Lacking
Being lack
C. Because of lack
D. Lack

答案查题题库