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【单选题】
两个闭合的,穿在一极光滑的绝缘杆上,如图所示,当条形磁铁 N 极自右向左插向圆环时,两圆环的运动是 ( )A.
边向左移边分开
B.
边向左移边合拢
C.
边向右移边合拢
D.
同时同向移动
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【单选题】What is the main topic of the conversation?
A.
Food packaging.
B.
Varieties of fish.
C.
A new snack food.
D.
An artificial food flavoring.
【简答题】one that studies the stylistic features of the main varieties of l ,
【单选题】To survive in the intense market competition, we must ______ the qualities and varieties of products we make to the world-market demand.
A.
improve
B.
guarantee
C.
gear
D.
enhance
【简答题】What are the two principal varieties of computer main memory?
【简答题】联合国为了推动电子商务立法，通过的两个重要的法律文件是（）和（）。
【单选题】In the world, there are over 2, 000 varieties of snakes, ______ are harmless to humans.
A.
only they
B.
most of them
C.
most of which
D.
which most
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