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【简答题】
交流电动机的调速方式有
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举一反三
【简答题】His irresponsible behavior has __________ (cause) a great deal of trouble to his sales team.
【判断题】如图,对于一个空腔导体,若空腔内没有电荷存在,则空腔导体的外表面所带电荷可以不为零,但内表面各处一定都不带电荷,且空腔内的场强也一定为零。即: s 外 可不为零,但 s 内 和 E 内 必为零。 ( s 为 面电荷密度 )
A.
正确
B.
错误
【单选题】Economics deals with how
A.
individuals make decisions to use scarce resources in order to satisfy their unlimited wants.
B.
to run a business.
C.
individuals become rich.
D.
society can eliminate scarcity.
【多选题】International economics deals with______
A.
international trade theory and policy
B.
international investment
C.
balance of payments and foreign exchange market
D.
open-economy macroeconomics
【单选题】Economics deals primarily with the concept of
A.
scarcity.
B.
money.
C.
poverty.
D.
banking.
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