渠道受冻胀力作用时()
A.渠底破坏最严重
B.渠坡下部破坏最严重
C.阴坡破坏最严重
D.渠底和渠坡破坏最严重
参考答案:D
Our farm is ________ Bill's. [ ]
A. twice bigger than
B. twice as bigger as
C. bigger twice than
D. twice the size
试述室上性心动过速发作期的处理。