焊接电流主要影响焊缝的()
A、熔宽
B、熔深
C、余高
D、熔合比
参考答案:B
--I'm going to Hainan with my parents this summer vacation.
-- ! [ ]
A. Have a good time
B. Best wishes
C. Congratulations
D. Please go
选冶车间选矿工艺由()等作业组成。