梯形可以画出一条对称轴.______.(判断对错)

题型:解答题

问题:

梯形可以画出一条对称轴.______.(判断对错)

考点:轴对称,轴对称图形
题型:解答题

任务型阅读

In the past twenty years, riding bicycles has become more and more popular among people of all ages. (3) Bicycles have long played an important part in the lives of American young people. But today an even greater number of adults cycle along roadsides and bicycle paths. These new riders are often trying to become fit or lose weight. They have found that bicycling is a pleasant way to stay healthy.

This is certainly good for health. But it has also brought some problems. With all these added people on the road, bicycle safety has become a matter of real importance.

Bicycle safety is mostly a matter of common sense. People should ride only on bicycle paths where they will not be badly hurt. There are also a number of rules that riders should follow, especially when riding on streets or highways. Bicyclists should never ride against the traffic ,nor should they carry other people on their bicycles. They are also supposed to ride in single line on busy streets and to "walk bicycles across the busy intersections (交叉路口) .

(4)By following these rules, bicycle riders will not only stay healthy but also be safe.

In one recent year, the National Safety Council reported that 34 thousand bicycle riders were hurt in highway accidents. In that same year, another six hundred riders were killed. Since the introduction of crash helmets (头盔) in 1980, the number of injuries (伤者) and deaths from bicycling accidents had gone down. Today, more and more riders realize the dangers of bicycling. They are wearing helmets and paying closer attention to cycling rules.

根据短文内容回答下列问题。

小题1:How many rules should the riders follow? Give one example.

_______________________________________________________________

小题2:According to the National Safety Council's report, what's the total number of injuries and deaths in one recent year?

________________________________________________________________

B. 将短文中划线部分译成汉语。

小题3:_______________________________________________________________

小题4:________________________________________________________________

C. 请给短文拟一个适当的英文标题。

小题5:________________________________________

题型:解答题

如图甲中的理想变压器,其原、副线圈的匝数比为10:1,R1=20 Ω,R2=40 Ω,C为电容器.已知通过R1的正弦交流电如图乙所示,则

    
[ ]

A.交流电的频率为0.02 Hz

B.原线圈输入电压的最大值为200 V  

C.电阻R2的电功率为10 W

D.通过R3的电流始终为零

题型:解答题

简述小儿腹泻低渗性脱水的临床表现。

题型:解答题

工程网络计划中的关键工作是指()的工作。

A.自由时差最小

B.总时差最小

C.工作持续时间最长

D.时距为零

题型:解答题

"产后汗多变痉,因气血亏损,肉理不密,风邪所乘",并提出用小续命汤治疗的是

A.《金匮要略》

B.《景岳全书》

C.《傅青主女科》

D.《诸病源候论》

E.《妇人大全良方》

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