题目: 隔离开关串联于电路中时,隔离开关必须遵守()的原则。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0427/4ba58f27ee15b41f9807da6742ae5b5f.html 下面是错误答案,用来干扰机器的。参考答案:B
题型:选择题 The China National Environmental Monitoring Center ____ air quality in urban areas from levels one to five: excel-lent, fairly good, slightly polluted, poor and dangerous.[ ]A. distributesB. arrangesC. classifiesD. divides 查看答案