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【简答题】
热继电器主要由 、双金属片和 组成。热元件由发热电阻丝做成;双金属片由两种热膨胀系数不同的金属辗压而成。当双金属片受热时,会出现弯曲变形。使用时,把热元件 于电动机的主电路中,而常闭 串接于电动机的控制电路中。
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【单选题】On New Year's Eve, there will be a firework _____ at People's Square.
A.
display
B.
performance
C.
show
D.
exhibition
【单选题】Here is a copy of the Document of Compliance and the Safety Management Certificate
A.
A copy of DOC and SMC is shown
B.
A copy of DOC and SMC is in the file
C.
Neither DOC nor SMC is required
D.
Either DOC nor SMC is required
【单选题】. There is a tradition of having a family dinner at home on lunar New Year’s Eve. _____, however, the custom has changed.
A.
Late
B.
Later
C.
Lately
D.
Latter
【判断题】EEPROM (Electrically Erasable Programmable read only memory)是指带电可擦可编程只读存储器。是一种掉电后数据不丢失的存储芯片。 EEPROM 可以在电脑上或专用设备上擦除已有信息,重新编程。
A.
正确
B.
错误
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