塑料管之间的连接宜采用（）。
A.套接管
B.承插式粘接
C.承插弹性密封圈连接
D.机械压紧管件连
参考答案：B, C, D
—How much ______the shirt?
—______ thirty yuan. [ ]
A. is; It's
B. are; They're
C. is; They're
D. are; It's
国家赔偿主要以( )方式进行。
A．返还财产或恢复原状 B．支付赔偿金C．口头道歉并返还财产或恢复原状 D．书面致歉并支付赔偿金
