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【单选题】
功率因素亦称力率，是有功功率与视在功率的比值。通常以（）表示。
A.
tag（∮）
B.
cat（∮）
C.
cos（∮）
D.
sin（∮）
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【单选题】在电动机正反转控制电路中,若两只接触器同时吸合,其后果( )。
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B.
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C.
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D.
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【单选题】在电动机正反转控制电路中,若两只接触器同时吸合,其后果是( )
A.
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B.
电源短路
C.
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【简答题】Ladies and gentlemen, welcome to Dalian, a famous summer resort ( 避暑胜地 ) and one of the best 1 ___________ (what?) in China. With clear sky, green mountains, blue seas, fine beaches, clean streets and...
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【单选题】In summer, local people stroll along the tree-lined______through the park every night.
A.
allies
B.
alleys
C.
alloys
D.
alliances
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【单选题】当费恩的母亲把一本书掉落在地板上时,费恩做出了反应,将双臂伸向侧面,伸出的手指好像要抓东西。这体现了新生儿的( )。
A.
抓握反射
B.
觅食反射
C.
莫罗反射
D.
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【单选题】听力原文： If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in the spring than you are at any other time of the year. A noted scientist, Ellsworth...
A.
Record of changes in his own intelligence.
B.
Work with people in different climates.
C.
Records of temperature changes.
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All records of changes in mental abilities.
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【单选题】当费恩的母亲把一本书掉落在地板上时，费恩做出了反应，将双臂伸向侧面，伸出的手指好像要抓东西。这体现了新生儿的哪种反射？
A.
抓握反射
B.
觅食反射
C.
莫罗反射
D.
强直性颈部反射
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【单选题】在电动机正反转控制电路中,若两只接触器同时吸合,其后果是( )。
A.
电源短路
B.
电动机不能转动
C.
电动机正常转动
D.
电动机转向不定
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【简答题】阅读理解。 People enjoy sports. Sports help to keep people healthy, happy and to live longer. Many people like to watch others play s. They buy tickets or sit in front of TV sets. Often they get very e...
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【单选题】在电动机正反转控制电路中,若两只接触器同时吸合,其后果( )。
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【简答题】Ladies and gentlemen, welcome to Dalian, a famous summer resort ( 避暑胜地 ) and one of the best 1 ___________ (what?) in China. With clear sky, green mountains, blue seas, fine beaches, clean streets and...
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【单选题】In summer, local people stroll along the tree-lined______through the park every night.
A.
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B.
alleys
C.
alloys
D.
alliances
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【简答题】阅读短文，按要求完成下列各题。 Spending time doing something relaxing is not a bad idea during the winter months, especially as the Spring Festival holiday draws closer. Sarah Combes a social worker at the Vista Cli...
查看完整题目与答案
【单选题】当费恩的母亲把一本书掉落在地板上时,费恩做出了反应,将双臂伸向侧面,伸出的手指好像要抓东西。这体现了新生儿的( )。
A.
抓握反射
B.
觅食反射
C.
莫罗反射
D.
强直性颈部反射
查看完整题目与答案
【单选题】听力原文： If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in the spring than you are at any other time of the year. A noted scientist, Ellsworth...
A.
Record of changes in his own intelligence.
B.
Work with people in different climates.
C.
Records of temperature changes.
D.
All records of changes in mental abilities.
查看完整题目与答案
【单选题】当费恩的母亲把一本书掉落在地板上时，费恩做出了反应，将双臂伸向侧面，伸出的手指好像要抓东西。这体现了新生儿的哪种反射？
A.
抓握反射
B.
觅食反射
C.
莫罗反射
D.
强直性颈部反射
查看完整题目与答案
【单选题】在电动机正反转控制电路中,若两只接触器同时吸合,其后果是( )。
A.
电源短路
B.
电动机不能转动
C.
电动机正常转动
D.
电动机转向不定
查看完整题目与答案
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