All the drivers were required to drive their cars____   caution. [ ]

A. in          

B. of          

C. with        

D. at

一般桩基础按设计图示( )计算。

A．桩长度(包括桩尖)
B．桩长度(不包括桩尖)
C．桩体积(包括桩尖)
D．桩体积(不包括桩尖)