滤线栅铅条会聚线到栅板的垂直距离称为（） A.栅焦距 B.栅比 C.栅密度 D.栅距

在一张长为9cm，宽为8cm的矩形纸片上裁取一个与该矩形三边都相切的圆片后，余下的部分中能裁取的最大圆片的半径为（    ）cm。

自定目标、自我奖赏属于（）涉及的方法与技能。

A、心理激活策略

B、时间管理策略

C、环境管理策略

D、寻求他人支持策略

It is quite reasonable to blame traffic jams, the cost of" gas and the great speed of modern life, but manners on the toad are becoming horrible. Eye,body knows that the nicest men would become fierce tigers behind the wheel. It is all right to have a tiger in a cage, but to have one in the driver’s seat is another matter.
Road politeness is not only good manners, but good sense too. It takes the most cool-headed drivers great patience to give up the desire to beat back when forced to face rude driving. On the other hand, a little politeness goes a long way towards reducing the possibility of quarrelling and fighting. A friendly nod or a wave of thanks in answer to an act of politeness helps to create an atmosphere of good will and calmness so necessary in modern traffic conditions. But such behaviors of politeness are by no means enough. Many drivers nowadays don’t even seem able to recognize politeness when they see it.
However, misplaced politeness can also be dangerous. Typical examples are the driver who waves a child crossing the street at a wrong place into the path of oncoming cars that may be not able to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to.
An experienced driver, whose manners are faultless, told me it would help if drivers learnt to correctly join in traffic stream without causing total blockages that give rise to unpleasant feelings. Unfortunately, modern drivers can’t even learn to drive,let alone master the roadmanship. Years ago, experts warned us that the fast increase of the car ownership would demand more give-and-take from all road users. It is high time for all of us to take this message to heart.

It is not always right for drivers to______.

A. master roadmanship
B. recognize politeness when they see it
C. encourage old ladies to cross the road whenever and wherever they want
D. give a friendly nod in answer to an act of politeness

关于运动与肌糖原的关系，错误的是（）

A.肌糖原是运动中的主要能源

B.运动开始时肌糖原的降解较快

C.运动强度愈大，肌糖原利用愈多

D.任何时候外源性葡萄糖都不能替代肌糖原供能

E.高强度长时间运动可完全耗尽肌糖原而出现衰竭