对位波幅调整在什么情况下使用()
A.纸张发生歪斜时
B.纸张出现折边或送纸故障时
C.前缘空白宽度发生变化时
D.排纸出现故障时
参考答案:A
To improve the quality of our products, we asked for suggestions _______ had used the product.
A.no matter who
B.who
C.whoever
D.whichever
导线切割磁力线时产生的感应电动势与磁场的磁感强度()。
A.无关
B.关系不大
C.成反比
D.成正比