题干

把一个图形先沿着一条直线进行轴对称变换,再沿着与这条直线平行的方向平移,我们把这样的图形变换叫做滑动对称变换.在自然界和日常生活中,大量地存在这种图形变换(如图1).结合轴对称变换和平移变换的有关性质,你认为在滑动对称变换过程中,两个对应三角形(如图2)的对应点所具有的性质是(    )

A:对应点连线与对称轴垂直

B:对应点连线被对称轴平分

C:对应点连线被对称轴垂直平分

D:对应点连线互相平行

上一题 下一题 0.0难度 选择题 更新时间:2019-12-20 11:16:01

答案(点此获取答案解析)

B

同类题2

根据短文内容,从短文后的七个选项中选出五个最佳选项填入空白处。

    As you're busy with your studies, the weeks during the Spring Festival can be a time when training and healthy eating plans go out of the window. But you can continue running and avoid weight gain during the holiday season. ____

Pick a race

    Having a race on your calendar is a motivation to keep running during the holiday. ____ Check our active.com or Running in the city for events near you.

Don't skip breakfast

    If you're going to a holiday party in the evening, don't make the mistake of skipping breakfast. You may think you're saving calories for later. ____

Bring your own healthy dishes

    Chances are that most of the dishes at holiday gatherings are going be high in taste and calories. Bring your own healthy appetizers to the party. The host will appreciate it, and you know where will be at least one wise choice on the buffet table.

____

    If you are heading to an evening event, eat regular meals and snacks every few hours until party time. You won't arrive at the party ready to attack appetizers. Make sure you include fiber at each meal because it keeps you full longer.

Plan your runs

    It's easy to say that you'll keep running regularly during the holiday season, but sticking to it requires a strategy. Schedule your runs like appointments, so you make them the first thing during a busy week. ____

A. Treat yourself

B. Eat small meals

C. Try some or all of these strategies.

D. In fact, it may lead to overeating later in the day.

E. Buy yourself a gift of some new running shoes and clothes.

F. If you have runs scheduled, you are more likely to get them done.

G. Once you choose one that is in a few weeks, set a plan and stick to it.