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There was once a large, fat woman who had a small, thin husband. He had a job in a big company and was given his weekly wage s every Friday evening. As soon as he got home on Fridays, his wife used to make him give her all his money, and then she used to give him back enough to buy his lunch in the office every day. One day the small man came home very excited. He hurried into the living-room. His wife was listening to the radio and eating chocolates there. "You'll never guess what happened to me today, dear," he said. He waited for a few seconds and then added, "I won ten thousand pounds on the lottery !" "That's wonderful!" said his wife delightedly . But then she thought for a few seconds and added angrily, "But wait a moment! How could you afford to buy the lottery tickets?" ===== question: The woman is good-natured.
A.
正确
B.
错误
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【简答题】_______ heart disease 冠心病
【单选题】关于同步发电机机端发生三相短路时短路电流中各分量的变化,下列说法中错误的是( )
A.
定子短路电流中的非周期分量和倍频分量以同一时间常数衰减到零
B.
定子绕组中的基频周期分量有效值从短路瞬间的数值逐渐衰减到稳态值
C.
定子绕组中的基频周期分量保持不变,其他分量逐渐衰减为零
D.
定子绕组中的基频周期分量在短路发生后开始阶段衰减速度快,后阶段衰减速度慢
【多选题】机器上设置安全护的主要作用是()
A.
使机器外观更美观
B.
将运动零部件与人隔离
C.
防止机器受到损坏
D.
容纳破坏的运动零件的碎块
E.
将有害物质密封
【简答题】翻译题:Studies comparing the rates of heart disease between countries with different eating habits show clearly that those people who eat a high-fat, low-fiber diet have a much greater risk of developing...
【单选题】Stress is widely perceived as contributing to coronary heart disease(冠心病).
A.
viewed
B.
believed
C.
spotted
D.
received
【单选题】某试样含钙量的置信区间为20.45 ±0.15%(置信度为90%),对此结果理解正确的是
A.
有90%的把握认为再测一次的值将落在20.30%~20.60%范围内
B.
总体平均值μ落在20.30%~20.60%范围内的概率为90% ;
C.
有90%的测定结果落在20.30%~20.60%范围内
D.
在此区间内,包括总体平均值μ的把握为90%。
【简答题】冠心病(coronary heart disease,CHD)
【单选题】关于同步发电机机端发生三相短路时短路电流中各种分量的变化,下列说法错误的是。
A.
定子短路电流中的非周期分量和倍频分量以同一时间常数逐渐衰减到零
B.
定子绕组中的基频周期分量有效值从短路瞬间的数值逐渐衰减到稳态值
C.
定子绕组的基频周期分量保持不变,其它分量逐渐衰减到零
D.
定子绕组中的基频周期电流分量在短路发生后开始阶段衰减速度快,后阶段衰减速度慢
【多选题】机器上设置安全防护罩的主要作用是( )。
A.
使机器外观更美观
B.
将运动零部件与人隔离
C.
防止机器受到损坏
D.
容纳破坏的运动零件的碎块
E.
将有害物质密封
【单选题】关于同步发电机机端发生三相短路时短路电流中各分量的变化,下列说法中错误的是( )
A.
定子短路电流中周期分量和倍频分量以同一时间常数衰减到零
B.
定子绕组中基频周期分量有效值从短路瞬间的数值逐渐衰减到稳态值
C.
定子绕组中基频周期分量保持不变其他分量逐渐衰减到零
D.
定子绕组中基频周期电流分量在短路发生后开始阶段衰减速度快,后阶段衰减速度慢
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