在亚粘土或粘土中，为避免降低承载力，一般以( )沉桩。
A．锤击
B．射水
C．射水为主，锤击或振动为辅
D．锤击或振动为主，射水为辅
参考答案：D
—— Is Tom still smoking ?
—— No.By next Saturday he ＿＿＿＿＿＿＿ for a whole month without smoking a single cigarette.
A．will go
B．will have gone
C．will have been
D．has been going
要求LCL保证不为负值的最小样本容量是______。
A．1200
B．891
C．600
D．800
