在接地体有故障电流流过时,接地体径向地面上水平距离为0.8米时,两点间的电压称之为()。
参考答案:跨步电压
If you'd like to take a seat in the waiting room till the doctor can see you,
you'll find plenty of magazines to _______. [ ]
A. look after
B. look through
C. look over
D. look into
读图,回答下列问题。
①②③④四地中如果只考虑纬度及海陆分布因素,气温年较差最大的是()
A.①
B.②
C.③
D.④