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【单选题】
| x | <0 的( )A.
( − ∞ , 0 ) ∪ (0 , + ∞) ；
B.
Ø ；
C.
{0} ；
D.
( − ∞ , + ∞) ；
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【简答题】阅读理解。 Advertising informs consumers about new products available on the market. It gives us information about everything from shampoo to tooth-paste to computers and cars. But there is one series prob...
【简答题】阅读理解。 Advertising gives useful information about which products to buy. But modern advertising gives more than news 1 products and services .Today's advertisements, or ads, try to get consumers to buy...
【简答题】Advertising gives useful information about which products to buy. But modern advertising does more than gives news about products and services. Today’s advertisements, or ads, try to get consumers to ...
【多选题】(多选)如图所示,在半径为R的圆形区域内充满磁感应强度为B的匀强磁场,MN是一竖直放置的感光板.从圆形磁场最高点P以速度v垂直磁场正对着圆心O射入带正电的粒子,且粒子所带电荷量为q、质量为m,不考虑粒子重力,关于粒子的运动,以下说法正确的是( )
A.
粒子在磁场中通过的弧长越长,运动时间也越长
B.
射出磁场的粒子其出射方向的反向延长线也一定过圆心O
C.
射出磁场的粒子一定能垂直打在MN上
D.
只要速度满足v=,入射的粒子出射后一定垂直打在MN上
【简答题】A．It gives too much music. B．It has too many programs for advertising. C．its noise does harm to our ears. D．It changes our daily live.
【简答题】Advertising gives useful information about which products to buy. But modern advertising gives more than news 16 products and services .Today’s advertisements, or ads, try to get consumers to buy cert...
【单选题】(Advertising) gives useful information about (which) (products) to (buying).
A.
Advertising
B.
which
C.
products
D.
buying
【简答题】D Advertising gives useful information about which products to buy. But modern advertising does more than gives news about products and services. Today’s advertisements, or ads, try to get consumers t...
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