检查麻醉乙醚的馏程,下列不正确的是()。
参考答案:使用水浴加热,水浴液面始终不得低于供试品的液面
门槛板内的插入件要用()的方法固定。
A.点焊
B.定位焊
C.塞焊
A bond is needed when the bill of lading cannot be availed of the time of entry of the im- ported commodities. What does the sentence mean.()
A. A bond is needed when the bill of lading is unavailable when the goods arrive at the destination.
B. A bond is needed when the bill of lading arrives at the port of destination.
C. A bond is not needed when the goods arrive at the destination.
D. A bond is needed when the goods arrive at the destination if there is no bill of lading at all.