切煤气操作应先切断高压侧煤气再操作低压侧防止憋压。()
万用表使用完毕后,应将选择开关放在交流高压挡。()
变压器绕组采用三角形接线时,绕组的线电压()其相电压。
A. 等于
B. 小于
C. 大于
A.It is healthier than green tea.B.It can grow in drier soil.C.It will replace green te
A. It is healthier than green tea.
B. It can grow in drier soil.
C. It will replace green tea one day.
D. It is immune to various diseases.