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【单选题】
下列关于变压器空载试验说法错误的是A.
通过变压器空载试验可以求出变比
B.
通过变压器空载试验可以求出励磁阻抗
C.
空载试验时，铁心中的涡流和磁滞损耗都是正常运行时的大小
D.
空载试验时，有功功率损耗主要是一次绕组的铜耗
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【单选题】And once you start replacing real human contact with cyber-interaction, coming back out of the cave can be quite difficult. What does " cave " here refer to?
A.
the isolated life of the virtual world.
B.
a large hole in the side of a hill or under the ground
【简答题】Correct the mistakes in the following sentences. 1. I would live in Nanjing when I was at primary school. 2. The explorer discovered the ancient cave in accident. 3. This course requires that every st...
【单选题】What measures does Suyuan take to try to ensure that her twin daughters are returned to her after the war with Japan?
A.
None
B.
She tattoos them with her name
C.
She writes the address of her family home in Shanghai on the backs of family photographs and stuffs the photos into the babies'clothing
D.
She hides them in a cave and memorizes the cave's location
【单选题】What conclusions does Dr. Samson draw from the lighting factor?
A.
Animal worship rituals were common in the morning.
B.
The artists never intended to make the images visible.
C.
The images were intended for early morning rituals.
D.
Ice-age hunters used torches in worshipping animals in the cave.
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