非黏性土的压实控制指标是( )。
A．相对密实度 B．天然密度C．干密度 D．含水量
参考答案：A
如果|a|=2，|b|=5，则ab=（ ）
A．10
B．-10
C．±10
D．以上答案都不对
He speaks English well indeed, but of course not___________a native speaker.
A． as fluent as
B． more fluent than
C． so fluently as
D． much fluently than
