台湾经济发展的特点是 [ ]
A.以化学工业为主
B.以重工业为主
C.以农副产品加工工业为主
D.以“进口—加工—出口”为主
答案:D
---What major will you choose when you are at university?
---____ but English, which has brought terrible dreams to me for the past 12 years.
A.Anything
B.Nothing
C.Something
D.Everything
封闭导体壳不论是否接地与否,内部场强不受外电荷的影响;接地的封闭导体外部场强不受壳内电荷的影响。这种现象叫()。
A、电磁感应
B、电磁屏蔽