如图所示的匀强磁场中,已经标出了电流I和磁感应强度B以及磁场对电流的作用力F这三

题型:选择题

问题:

如图所示的匀强磁场中,已经标出了电流I和磁感应强度B以及磁场对电流的作用力F这三者的方向,其中正确的是(  )

A.

B.

C.

D.

考点:磁场对通电导线的作用:安培力、左手定则
题型:选择题

正式足球比赛对球的周长有一定的要求,其要求是()。

A.68cm~71cm

B.69cm~70cm

C.69cm~71cm

题型:选择题

单词拼写. 根据句意,填入正确的单词形式(注意词形的变化;仅限一词).

小题1:Just two days after we had received our c_________________ orders to join the D-Day landing troops, we found ourselves outside a peaceful village.

小题2:The boy was one of the _______________(幸存者) of the invasion.

小题3:The criminal was _________________(判处)to death.

小题4:Millions of fans admire his athletic ability, ___________ _ (动力)and confidence.

小题5:E_____________, your child will leave home to lead her own life as a fully independent adult.

小题6:If you say that something is c____________, you mean it has so many parts or aspects that it is difficult to understand or deal with.

小题7:He is one of those people               (值得) to make more than the minimum wage.

小题8:Finally the barber picked up a pair of s           and a comb, and cut my hair.

小题9:The barber had a magnificent m_____________, which he used wax to keep in shape.

小题10:In 2003, there were fifteen peacekeeping operations , involving nearly 37,000 p____________(soldiers and civilians).

题型:选择题

改正下列错误的说法.

(1)加热氧化汞生成汞和氧气,氧化汞中含有氧气分子.改正为______.

(2)氢气在氧气中燃烧生成水,水中含有氢分子和氧分子.改正为:______.

(3)含氧的化合物都是氧化物.改正为:______.

(4)碳和氧气反应后,生成了二氧化碳,所以说二氧化碳是由碳和氧气构成的.改正为:______.

题型:选择题

单纯做浅静脉高位结扎术的指征是()

A.浅静脉瓣膜功能不全、交通支瓣膜功能正常

B.浅静脉瓣膜功能不全、交通支瓣膜功能不全

C.深静脉瓣膜功能试验瓣膜功能正常

D.深静脉瓣膜功能试验瓣膜功能失常

E.浅静脉瓣膜功能

题型:选择题

沉淀池的运行管理中主要工作为()。

A.取样

B.清洗

C.撇浮渣

D.排泥

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