NB/T47014-2011《承压设备焊接工艺评定》中,对接焊缝试件拉伸试验按GB/T228规定试验方法测定焊接接头的()。
A、抗拉强度
B、屈服强度
C、疲劳强度
参考答案:A
24.—I just heard you had an adventure in the desert.
—We lost our way and ______ made matters worse was that our jeep broke down.
A.how
B.that
C.it
D.What
机械手吸不住盘片,应先检查什么?