容器开孔补强圈应在压力试验之前通入（）MPa的压缩空气检查焊缝质量。
A.0.2～0.3
B.0.4～0.5
C.0.6～0.7
参考答案：B
小题1:You should learn to (尊重)the ideas of others.
小题2:I was ___________（满意的）with our treatment at that hotel.
小题3: ___________（不幸地）,I missed the last bus.
小题4:She spent years ____________（观察）and recording their daily activities.
小题5:We measured the _________ ( 长度) and the width of the living room.
小题6:I’m glad you have___________(克服) the difficulty.
小题7:We are taking our vacation in ___________(七月)
下列（）可以申请开办衍生产品交易业务。
A.城市商业银行
B.农村商业银行
C.农村合作银行
D.财务公司
