两个性质相同的土样，现场载荷试验得到变形模量E0。和室内压缩试验得到压缩模量Es之间

在面向对象方法中，类之间共享属性和操作的机制称为______。

具有“白颈”特征的药材是( )

A．地龙

B．水蛭

C．斑蝥

D．蜈蚣

E．全蝎

John's car is not here. I think he ______ somewhere. [ ]

A. goes

B. went

C. has gone

D. will go

_____ you come to cities in China, you would have to take off your shoes before

going into someone's house.[ ]

A. Might

B. Could

C. Would

D. Should

绞车制动闸的制动力矩越多越好。