一平底玻璃杯,杯内水深0.05m,总重为1.2N,底面积为2×10-3m2,放在

题型:问答题

问题:

一平底玻璃杯,杯内水深0.05m,总重为1.2N,底面积为2×10-3m2,放在水平桌面上.(g=10N/kg)

求:(1)水对杯底的压力,压强各是多少大?

(2)杯对桌面的压力,压强各是多少大?

考点:液体压强的计算压强的大小及其计算
题型:问答题

劳动合同包括必要条款和选择性条款。下列劳动念扁事项中,属于选择性条款的是()。

A.劳动报酬

B.试用期条款

C.劳动合同期限

D.工作时间

题型:问答题

下列哪些现象是为了防止物体产生离心运动(    )

A.汽车转弯时要限制速度

B.转速很高的砂轮半径不能做得太大

C.在修筑铁路时,转弯处轨道的内轨要低于外轨

D.用洗衣机脱去湿衣服中的水

题型:问答题

所有事故均应当按照事故原因未查明不放过,责任人未处理不放过,()未落实不放过,有关人员未受到教育不放过的“四不放过”原则进行处理。

A.整改方案

B.整改措施

C.整改检查

题型:问答题

语法填空。

     An 8.8magnitude earthquake struck Chile on 27 Feb,2010.More than 300 people are

reported __1__(kill) in Chile after a magnitude 8.8 earthquake hit the South American nation

early Saturday,__2__(cause)considerable destruction as well,and creating tsunami warnings

across the Pacific Ocean.

     Rescuers worked frantically for hours to help survivors of the quake __3__centered 100

kilometers from the city of Concepcion but caused damage and deaths in several parts of Chile.

     Homes,buildings and bridges collapsed or caught fire,cars __4__(overturn),and the main

international airport had to be shut down because of damage.One survivor said it was terrible.

She said she thought she was not __5__(scare)of earthquakes but then,she says,it looked

as if everything was going to collapse.There were at least eight aftershocks and tidal waves

__6__up to two meters that hit Chile's coast.Residents in lowlying areas and living on islands

off the mainland tried to flee __7__higher ground.Chile experiences many earthquakes but

the early Saturday natural disaster was __8__of its most severe.Thorne Lay,a geophysicist

at the University of California,Santa Cruz,said it was much stronger than __9__one that

caused devastation(废墟)in Haiti last month,but probably less __10__(destroy),because

of where it was centered.

题型:问答题

能够使食品中苯并(a)芘含量增加的方法是______。

A.烘烤

B.煮

C.蒸

D.卤

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