排水管道安装完毕，应进行充水试验，用以检查安装质量。( )
参考答案：对
________, I'll wait for you to have dinner together. Be back as early as possible.[ ]
A. However late it is
B. No matter how it is late
C. However it is late
D. No matter how late is it
长期应用可乐定后突然停药可引起（）
A．后遗反应
B．停药反应
C．特异质反应
D．变态反应
E．副反应
