第4题: [单项选择]弧垂过大或过小的危害是() A. 弧垂过大易引起导线碰线,弧垂过小因导线受拉应力过大而将导线拉断 B. 弧垂过大易引起导线拉断,弧垂过小影响导线的载流量 C. 弧垂过小易引起导线碰线,弧垂过大因导线受拉应力过大而将导线拉断 D. 弧垂过小易引起导线拉断,弧垂过大影响导线的载流量 参考答案:A
第7题: [填空题]The department is fortunate in having the most _____ equipment with to complete its research. 参考答案:up-to-date 答案解析:解析:
The departmentu(部门) is fortunate(幸运) in having the most up-to-date(新式的) equipment(设备) with whic