对于天然砂砾室内确定其最大干密度较适宜方法为______。
A．重型击实法 B．轻型击实法C．灌砂法 D．表面振动压实仪法
参考答案：D
降压同时伴心率加快的药物是
A．雷米普利
B．拉贝洛尔
C．肼屈嗪
D．哌唑嗪
E．硝苯地平
_______ she was standing and waiting for a bus that she caught sight of the former President Clinton.
A．It was while
B．As soon as
C．While
D．During the time when
