如图所示，质量分别为1 kg和2kg的A、B两物体叠放在一起，A用绳_爱下问搜题

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问题填空题

如图所示，质量分别为1 kg和2kg的A、B两物体叠放在一起，A用绳系住，放在B的右端。今用力F将B向右拉出，已知F="5" N，A、B问的滑动摩擦力为1N，B板长2 m。从A在B右端开始到A(可看成质点)脱离B板过程中，拉力F做功为 __________J，物体B对物体A的摩擦力做功为__________J，物体A对物体B的摩擦力做功为_______J。

答案

10 0 -2

拉力F做功为，A物体相对于地面保持静止状态，所以物体B对物体A的摩擦力做功为0J，物体A对物体B的摩擦力做负功，

故答案为：10 0 -2

完形填空

Two men, both seriously ill, occupied the same hospital room.   36  man was allowed to sit up in his bed for an hour each afternoon. His bed was next to the room's only   37 . The other man had to spend all his time flat on his back.
They talked for hours   38 . Every afternoon when the man by the window could sit up, he   39  pass the time by describing to his roommate all the things he could see outside the window. The other man felt his world would be   40  and enlivened by all the wonderful world outside.
The window overlooked a   41  with a lovely lake. Ducks played on the water while children   42  their model boats. Young lovers walked arm in arm in flowers. A fine view of the city skyline could be seen in the   43 .
As the man by the window described all this in delicate   44 , the other man would close his eyes and   45  the picturesque scene. One warm afternoon the man by the window described a parade   46 .   47  the other man couldn't hear the band, he could see it in his mind's eye as the gentleman by the window pictured it with   48  words.
Days and weeks passed.
One morning, the nurse arrived,   49  to find the lifeless body of the man by the window, who had died peacefully in his sleep. She was saddened and had the body taken away.
The other man asked to be   50  next to the window. Painfully, he sat up to take his first look at the world outside.   51 , he would have the joy of seeing it for himself.
He slowly turn to look out the window. It faced a blank wall.
The man asked the nurse what could have   52  his roommate to describe such wonderful things outside. The nurse   53  that the man was blind. "Perhaps he just wanted to   54  you."
Shared grief is half the sorrow,   55  happiness when shared, is doubled.

A．passing away

C．passing down

D．passing out

A．descriptive

B．surprisingly

C．sceptically

A．substituted

D．Occasionally

单项选择题

生产经营发生生产安全事故造成人员伤亡、他人财产损失的，应当依法承担（），拒不承担或者其负责人逃匿的，由人民法院依法强制执执行（）。

A.民事责任

B.刑事责任

C.行政责任

D.赔偿责任