异步电机的型式试验项目:效率、功率因数及转差率的测定。()
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1级长霉程度为肉眼看不到长霉,但放大50倍观察长霉十分明显。()
A. 对
B. 错
示范操作是一种直观、简练、通用的教学形式。()
A. 对
B. 错
长霉试验的目的是鉴别电机产品及其材料的在霉菌生长的条件下的长霉程度,鉴别( )引起的表面变化对它们的影响。
A. 霉菌
B. 除霉
C. 长霉
D. 短霉
For what purpose did the Canadian government make gold seekers bring one year's supplies with them
A. To prevent them from dying of hunger and cold.
B. To equip the army with enough food for fighting a war.
C. To enable them to trade with the Eskimos.
D. To make Alaska prosperous with the supplies.