每个预制构件均需进行回弹仪测试,测试在生产后()进行。
A.7d
B.14d
C.21d
D.28d
参考答案:D
下列指标中以大于2为好的是( )。
A.偿债备付率
B.速动比率
C.资产负债率
D.利息备付率
________it is hoped that college students should be equipped with the ability to take a good set of notes, this is not always the case.
A.When
B.While
C.As
D.Unless