《城市道路设计规范》CJJ37将城镇道路路分为四类，它们是()、主干路、次干路与支路。
A.快速路
B.放射路
C.环路
D.过境路
参考答案：A
He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system _________.
A．broke in
B．broke up
C．broke out
D．broke down
流行性出血热早期出现休克是因为
A．继发严重感染
B．心肌损害
C．腔道大出血
D．弥散性血管内凝血
E．小血管通透性增加，大量血浆外渗
