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【单选题】
直流电动机常用的启动方法有电枢串电阻启动、( )等。A.
弱磁启动
B.
降压起动
C.
星三角启动
D.
变频启动
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举一反三
【单选题】Whether or professional, American football is perhaps the most popular sport in the US. It attracts a total attendance of over 40 million and is watched by many more millions on television each year.
A.
individual
B.
endurance
C.
gear
D.
amateur
【单选题】The author believes that our knowledge of social systems is more secure than that of physical systems because ______.
A.
it is not based on personal experience
B.
new discoveries are less likely to occur in social sciences
C.
it is based on a fairly representative quantity of data
D.
the records of social systems are more reliable
【单选题】is watched in a more relaxed and lazy way than other ball games.
A.
Football
B.
Basketball
C.
Baseball
D.
Tennis
【简答题】Whether or professional, American football is perhaps the most popular sport in the US. It attracts a total attendance of over 40 million and is watched by many more millions on television each year.
【单选题】Whether ________ or professional, American football is perhaps the most popular sport in the US. It attracts a total attendance of over 40 million and is watched by many more millions on television ea...
A.
amateur
B.
amatory
C.
amazing
D.
amassed
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