题干

如图四幅图对应的说法正确的是(   )

A:某同学沿杆匀速向上爬升时,该同学受到的摩擦力方向竖直向上

B:筷子提米在空中静止时,筷子所受米粒作用的摩擦力方向竖直向上

C:在力F拉动B使其速度逐渐变大过程中,弹簧测力计示数也逐渐变大

D:每隔相等时间拍摄向右运同学位置图片,可知该同学运动越来越快

上一题 下一题 0.0难度 选择题 更新时间:2019-11-19 05:18:49

答案(点此获取答案解析)

A

同类题5

根据短文理解,选择正确答案。

    Canada is one of the few nations in the world to have two official languages:English and French. There are 10 provinces in the country but only one of these—Quebec is known as "French Canada". This is because it was founded by French explorers while British adventurers discovered the rest.

    Canada left the Britain in 1867 to become an independent country, and English and French have been recognized as the official languages ever since.

    Most people speak English as their first language and the two national television networks broadcast in English throughout the country. Apart from in Quebec and a few places on the east coast, French television is very rare.

    The same goes for traffic signs and menus, for example. Outside of Quebec, there are only a few places where you'll see traffic signs in French. In restaurants, it's almost impossible to find French on the menu unless you are in the heartland of French Canada. However, all products sold in Canada must, by law, have labels(标签)and instructions in both languages.

    In Canada's English speaking provinces, official bilingualism(双语)means that students can choose to complete a special French language course. Under this programme, they are taught most of their subjects in French. If a student begins the course in kindergarten(幼儿园)or Grade One, it is likely that all their lessons will be in French. However, if they start at junior high school, 25 per cent of the teaching will continue to be in English.