起重机两轨道同一截面高度不得大于10mm,且每根轨道长度方向()。A、每2m测量程度

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问题:

起重机两轨道同一截面高度不得大于10mm,且每根轨道长度方向()。

A、每2m测量程度不得大于2m

B、每2m测量程度不得大于4m

C、全长不得超过10mm

D、全长不得超过15mm

考点:起重机操作证考试桥门式起重机司机桥门式起重机司机题库
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青春是美丽的。关注自己的形象,既要关注自己外在的形象,又要关注自己内在的素质。“腹有诗书气自华”说的是 (   )

A.一个人的外在美很重要  

B.一个人的内在美就是一个人的外在美,二者没有区别

C.一个人的外在形象就是一个人的内在素质

D.一个人的内在美对外在美起促进作用

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Drivers on the Basingstoke by-pass used to have their attention diverted by a sign that reads A MOMENT’S INATTENTION CAUSES ACCIDENTS. This self-defeating warning has now been removed, but its message is still very much to the point.

Almost anything can cause an accident. Apart from momentary inattention, it might be a minor miscalculation, a sudden fit of coughing, a bop on the head with a teddy-bear from a child in the back seat, an argument with the wife, fog, falling asleep at the wheel, bad eyesight, a glaring sun, ice, rain, wind, or snow-all these can make the difference between a tragic hit and a lucky miss.

Although human error plays its part, it is by no means the only cause of accidents. There must be some cause other than simple human error. Road construction plays its part: researchers have found that it is not at the obvious danger spot- sharp corners, cross-roads, narrow lanes — that accidents happen. It is on those roads where there are subtle visual traps, unexpected changes in the shape or surface of the road, or even insufficient or badly-placed signs. Wherever there is a "black spot", it means that something is seriously wrong with the road. Why else did the careless driving of so many come out at that particular spot

What the law requires when you have an accident.

There are, firstly the legal formalities of exchanging names and addresses with others involved in an accident and, in Certain cases, informing the police. However, you are required by law to stop after an accident only if.

1. Somebody other than yourself in or outside your car has been injured.

2. A vehicle not of your own has been damaged.

3. Any horse, cow, donkey, sheep, or dog has been injured.

It has been said that if a driver continues unaware of causing injury he must be acquitted. But the courts are wary of that excuse. Furthermore, the driver himself must wait at the scene; it is not enough for him to leave his chauffeur or a friend to attend to the boring formalities while he goes off on more important business.

If you have been involved in an accident and have stopped, you must give your name, address, and registration number to anyone who has a good reason for requesting it; this means anyone affected by the accident. If these formalities which are complied with it is not necessary to wait for the arrival of the police. It is, however, often wise to do so. The police are experts at drawing plans, taking measurements and photographs and gathering other evidence. In your absence the police could be given a biased story against you; and you yourself might warn to point out certain features of the accident to the police.

A MOMENT’S INATTENTION CAUSES ACCIDENTS (para. 1) is a self-defeating warning because ().

A.it will make a driver wait at the scene

B.it will distract the driver’s attention

C.it is too difficult to understand

D.it is too long to be read by drivers

题型:多项选择题

如图所示,长L=1.6 m,质量M=3 kg的木板静放在光滑水平面上,质量m=1 kg的小物块放在木板的右端,木板和物块间的动摩擦因数μ=0.1。现对木板施加一水平向右的拉力F,取g=10 m/s2,求:

(1)使物块不掉下去的最大拉力F;

(2)如果拉力F=10 N恒定不变,小物块的所能获得的最大速度。

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抢险救援的基本程序?

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下列不属于行政强制执行方式的有()

A、行政拘留

B、责令停产停业

C、扣押财物

D、排除妨碍、恢复原状

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