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【单选题】
在电极式锅炉水位控制系统中，在 情况下，给水泵电机保持断电，停止向锅炉供水A.
．从下限上升至上.下限之间水位
B.
． 从上限下降到上.下限之间水位
C.
．只要水位在上.下限水位之间
D.
．水位在下限水位
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【判断题】高压熔断器是认为的在电网中设置一个最薄弱的发热元件,当过负荷电流或短路电流流过该元件时,利用其熔本身产生的热量将自己熔断,从而使电路断开,达到保护电网电气设备的目的。
A.
正确
B.
错误
【单选题】Geography also _____ a part in making dialects. Some people living in the mountains speak with an older kind of English dialect. [ ]
A.
makes
B.
has
C.
takes
D.
plays
【单选题】If a language has a large number of speakers or if it is very old, there may be differences in the way it is spoken in different areas. That is, the language may have several dialects. Chinese is a go...
A.
the difference between the old and today’s Chinese
B.
a special language spoken by Chinese
C.
the form of a language used in one part of the country
【单选题】In China hundreds of different dialects are spoken; people of some villages ______ themselves understood by the inhabitants of the next town.
A.
making trouble have
B.
have making trouble
C.
have trouble making
D.
trouble making have
【简答题】兴中会比同盟会誓词缺少的内容在于（）
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【判断题】高压熔断器是认为的在电网中设置一个最薄弱的发热元件,当过负荷电流或短路电流流过该元件时,利用其熔本身产生的热量将自己熔断,从而使电路断开,达到保护电网电气设备的目的。
A.
正确
B.
错误