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【单选题】
采用比率制动式的差动保护继电器，可以（）。A.
躲开励磁涌流
B.
提高保护内部故障时的灵敏度
C.
防止电流互感器二次回路断线时误动
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【简答题】单词拼写： 76. Light , heat, and electricity are different forms of e____________. 77. Eating more vegetable and less fat will greatly b___________ your health. 78. The a_________ size for British schools ...
【简答题】组合体三视图的可见轮廓线用何种线型表示?
【判断题】下面语篇中句(2)是关于insect-eaters如何取得水分的。 (1)Animals in the desert have a problem getting water and keeping it. (2)Insect-eaters get their liquids from their food. (3)Most desert dwellers avoid the drying hea...
A.
正确
B.
错误
【单选题】Animals in the desert have a problem getting water and keeping it. Insect-eaters get their liquids from their food. Most desert dwellers avoid the drying heat as much as possible, spending their time ...
A.
reptiles are harmless during daylight
B.
birds sleep by day and hunt by night
C.
coyotes are vegetarians
D.
insects store water in their bodies
【单选题】The phrase 'heat recovery' refers to a ______.
A.
method of concealing the source of heat
B.
special form. of air-conditioning
C.
supplementary hot water system
D.
way of reclaiming and re-using heat
【判断题】下面语篇的句(6)-句(8)是关于reptiles如何保持水分的。 (1)Animals in the desert have a problem getting water and keeping it. (2)Insect-eaters get their liquids from their food. (3)Most desert dwellers avoid the drying hea...
A.
正确
B.
错误
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