下列焊条牌号中，( )是型号为EZNi-1的铸铁焊条。
A. Z208
B. Z308
C. Z408
D. Z508
查看答案
Half of the graduates can't make up their minds partly because ______.
A. they find job security a big problem
B. they don't want to make their decisions alone
C. their parents' opinions have some influence on them
D. most of them like to work in state enterprises
应检查焊钳的导磁性、隔热性、夹持焊条的牢固性和耐蚀性。（）
A. 对
B. 错
焊钳的( )是应该检查的。
A. 导磁性
B. 热膨胀性
C. 夹持焊条的牢固性
D. 塑性
( )属于埋弧焊焊机控制系统的测试内容。
A. 引弧操作性能
B. 焊丝的送进和校直
C. 小车行走的平稳和均匀性
D. 输出电流和电压的调节范围
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