焊接电源绝缘的可靠性、接线的正确性、电源的动特性、接地的可靠性、电源的外特性等,在焊条电弧焊施焊前必须进行检查。( )
参考答案:对
多单枝,细小弯曲如钩,过桥较短的是()
A.云连
B.雅连
C.峨眉野连
D.味连
E.短萼黄连
The advertisement says this material doesn’t ______ in the wash, but in reality it does.
A.decrease
B.shrink
C.slim
D.disappear