（）支护这种布置方式的截深是顶梁长度的一半。每进一刀，隔一架棚挂一根梁。
参考答案：错梁式
已知空气的单位体积质量为0.00124 克/厘米3，0.00124用科学记数法表示为[ ]
A．1.24×102
B．1.24×103
C．1.24×10-2
D．1.24×10-3
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
