在宽度小于( )m的走道顶棚上设置探测器时宜居中布置。
A．3
B．5
C．10
D．15
参考答案：A
胸膜下界在锁骨中线处相交于（）。
A.第6肋
B.第6肋间
C.第8肋
D.第8肋间
E.第10肋
—Did you catch the early bus this morning?
—No.It had left the stop _____ I arrived there.[ ]
A. as soon as
B. as the time
C. by the time
D. during the time
