下列荒漠化问题与所对应的地区,正确的是[ ]
A、东北平原—原生盐渍化
B、三江平原—次生盐渍化
C、西北干旱地区—沙漠化
D、黄淮海平原—石漠化
答案:C
—My father has decided to________ smoking.
—That's good news for us. I hope so. [ ]
A. give up
B. take out
C. give in
D. turn off
异步电动机的定子绕组和转子绕组既有磁的耦合,在电路上也是相通的。()