秤上用的油阻尼器在杆平衡不动时,阻尼就()。
A.没有了
B.仍然有
C.减小了
参考答案:A
— I ______ have turned on the air conditioner at such a low temperature.
— No wonder you've got a cold. [ ]
A. shouldn't
B. couldn't
C. mustn't
D. needn't
某码头工程在对粉砂土进行标准贯入测试时测得标贯击数为33击,地下水位与地面齐平,该粉 砂土的密实程度为()。
A.松散
B.稍密
C.中密
D.密实