熔化极气体保护焊焊接设备主要由()控制系统组成。
A、焊接电源
B、送丝系统
C、焊枪及行走系统(自动焊)
D、供气系统和冷却水系统
参考答案:A, B, C, D
41. —Well, it's getting late. I must be going. Thank you again for inviting me to the party.
—________
A.Oh, it's already so late?
B.Thank you for coming.
C.Oh, sorry you could't come.
D.I really had a happy time.
加油站交接班时,应对油罐进行计量,统计本班次的()。出现大亏大溢,要及时查找原因,作出分析。
A.付油量
B.损溢量
C.加油量
D.销售量