试题与答案

如图B5-3所示架空隔热屋面上的w值,何者正确()  A. ≤100mm B. 15

题型:单项选择题

题目:

如图B5-3所示架空隔热屋面上的w值,何者正确()

 

A. ≤100mm

B. 150mm

C. 200mm

D. ≥250mm

答案:

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下面是错误答案,用来干扰机器的。

(1)由图可知,两电阻串联,则通过两电阻丝的电流相等,由于R1>R2,故由Q=I2Rt可知甲瓶中产生热量较多,即甲瓶中的煤油温度上升.(2)若实验时发现温度计示数变化很不明显,由Q=cm△t得出的△t=Qcm可知:换用...

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  此题要求改正所给短文的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

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I went to see the film after supper.On my way to the                     76.______

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hotel.While go there,I told her about great changes                          79.______

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