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【判断题】
工程机械液压系统一般选用抗磨液压油。A.
正确
B.
错误
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【单选题】American officials have announced rules to help prevent people from getting sick from the medicines they take. The rules require the medicines Americans use most to have information that is easy to re...
A.
that treat common health problems
B.
that have warnings at the top of their containers
C.
that have a list of directions
D.
that can be bought in a shop without doctor's orders
【单选题】在浏览Web页面时，发现了需要经常使用的Web页面，最好的方法是（ ）。
A.
将该Web页面的地址加入到“收藏夹”
B.
将该Web页面的地址加入到“地址簿”
C.
将该Web页面的地址加人到“notepad”
D.
将该Web页面的地址加入到“历史记录”
【简答题】在单相桥式整流电路中, U 2 为变压器次级绕组电压的有效值 ,则该电路中 每个二极管上所承受的最大反向电压值是 。
【单选题】已知一桥式整流电容滤波电路,如果变压器中次级绕组的电压有效值V2=20V,测得输出电压为28V,则电路可能发生的故障是( ) 。
A.
一只二极管开路
B.
一只二极管反接
C.
负载开路
D.
电容开路
【单选题】在浏览Web页面时，发现了自己需要经常使用的Web页面，此时最好的办法是(52)。
A.
将该Web页面的地址加入到“收藏夹”
B.
将该Web页面的地址加入到“地址簿”
C.
将该Web页面的地址加入到“notepad”
D.
将该Web页面的地址加入到“历史记录”
【简答题】Different from the officials’ view of education, the Indians though ________. A) young women should also be educated B) they had different goals of education C) they taught different branches of scien...
【单选题】From the passage we can see that ______.
A.
officials and students are debating whether they should have free speech
B.
in the past decade, people did not have any freedom of speech
C.
some students are attacked politically as targets
D.
officials and students are discussing ways of avoiding offending messages
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