合金隔热挡板具备手动打开条件,首先打开(),然后打开真空锁内的振动给料器,最后打开下部密封阀。
A.下部密封阀
B.振动给料器
C.合金隔热挡板
D.旋转给料器
参考答案:C
______the bad weather, they finished all the work on time. [ ]
A. Though
B. Because of
C. No matter how
D. Despite
中国期刊网高级检索增加的处理内容是什么?