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【单选题】
剪力螺栓在破坏时,若栓杆细而连接板较发生( )破坏;若栓杆粗而连接板较,易发生构件挤压破坏。A.
栓杆受弯破坏
B.
构件挤压破坏
C.
构件受拉破坏
D.
构件冲剪破坏
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【简答题】变压器的功率是视在功率，单位是（），电动机的功率是有功功率，单位是（）。
【简答题】Joe Sanders has___ ______ ____(1.beautiful, 最漂亮的) garden in our town. Nearly everybody ______(2.enter) "The Nicest Garden Competition" each year, but Joe ______(3.win) every time. Bill Frith's garden ...
【单选题】one of these sentences is true. which one?
A.
Bill frith's garden is the best and Joe's is the worst
B.
Joe's garden is the best and Bill frith's is the worst
C.
the writer's garden is the best and Joe's is the worst
D.
Joe's garden is the best and the writer's is the worst
【判断题】功率因数等于有功功率比视在功率，指的是视在功率转化为有功功率的比例。功率因数等于cosj,式中j为电压相位减去电流相位，也就是电压相量和电流相量的相角差。
A.
正确
B.
错误
【单选题】One of these sentences is true. Which one?
A.
Bill Frith's garden is the best and Joe Sanders' is the worst.
B.
Joe Sanders' garden is the best and Bill Frith's is the worst.
C.
The writer's garden is the best and Joe Sanders' is the worst.
D.
Joe Sanders' garden is the best and the writer's is the worst.
【简答题】Lesson 8 The best and the worst 最好的和最差的 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> Joe Sanders has the most beautiful garden in our town. Nearly everybody enters for 'The ...
【判断题】功率因数等于有功功率比视在功率,指的是视在功率转化为有功功率的比例。 功率因数等于 ,式中, 为电压相位减去电流相位,也就是电压相量和电流相量的相角差。
A.
正确
B.
错误
【简答题】有功功率是视在功率的一部分,有功功率在视在功率中所占的比重,称为 _______。
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