注浆前注浆管路必须用清水进行试压,压力达到()且维持30分钟时间后方可进行注浆。
A、10MpA、以上
B、12MpA、以上
C、8MpA、以上
D、6MpA、以上
参考答案:A
Experiments of this kind ___in both the U.S and Europe well before the Second World War.
A.had conducted
B.have conducted
C.have been conducted
D. had been conducted
脱肛多属( )
A.气虚证 B.气陷证 C.气逆证 D.气滞证 E.气脱证