( )适用于发生在地面的单个管涌或管涌数目虽多但比较集中的情况。
A．砂石反滤围井
B．土工织物反滤围井
C．梢料反滤围井
D．反滤围井
参考答案：D
The best method to _____ the goal of helping the patients with AIDS is to unite as many sympathetic
people as possible. [ ]
A. complete
B. command
C. accomplish
D. accompany
风湿性瓣膜病并发症的主要死因是
A．心律失常
B．肺部感染
C．栓塞
D．心力衰竭
E．感染性心内膜炎
