焊接电流增加时，导致电弧潜入熔池，使电弧摆动范围缩小，促使熔宽（）。
参考答案：减少
油盒进水会产生的现象和危害是（）。
A.电机发热
B.油质变成乳白色
C.润滑不良
D.油盒发热
Which of the following choices best describes the effects on consumption, investment, and net exports that would result from an increase in the price level, other factors held constant Consumption Investment Net exports（）①A. Decrease Decrease Decrease ②B. Decrease Increase Increase ③C. Increase Decrease Decrease
A. ①
B. ②
C. ③
