可使运动变得省力的是() A.加长阻力臂或缩短力臂 B.加长阻力臂或力臂不变 C.缩

题型:单项选择题

问题:

可使运动变得省力的是()

A.加长阻力臂或缩短力臂

B.加长阻力臂或力臂不变

C.缩短阻力臂或加长力臂

D.加长力臂或阻力臂不变

E.缩短力臂或阻力臂不变

考点:专业必修课康复门诊康复门诊题库
题型:单项选择题

一架飞机在某灾区上空沿水平方向匀速飞行,同时向地面空投救灾物资。投下物资后,飞机的动能和重力势能发生的变化是( )

A.动能不变,重力势能变小

B.动能变小,重力势能不变

C.动能和重力势能都不变

D.动能和重力势能都变小

题型:单项选择题

直流电阻测试中,同一温度下各绕组电阻的相间差别或线间差别不大于()。

A.0.5%

B.1%

C.2%

D.4%

题型:单项选择题

()负责建筑安全生产的监督管理。

A.劳动行政主管部门

B.建筑业协会

C.建设行政主管部门

D.国务院

题型:单项选择题

When I was growing up, I was embarrassed to be seen with my father. He (1) severely crippled and very short, and when we would walk together, his hand on my arm (2) balance, people would stare. I would inwardly be afraid (3) squirm at the unwanted attention. If he ever noticed or was bothered, he never let (4) .
It was difficult to coordinate (5) steps - his halting, mine impatient - and because of that, we didn’t say much as we went along. But as we started out, he always said, "You (6) the pace. I will try to adjust to you. "
Our usual walk was to or (7) the subway, which was how he got to (8) . He went to work sick, and (9) nasty weather. He almost never missed a day, and would (10) it to the office even if (11) could not: a matter of pride!
He never talked about himself as an object of pity, (12) did he show any envy of the more fortunate or able. What he looked for in others was a "good heart", and if he found one, the owner was good enough for him.
Now that I am older, I believe that is a proper standard (13) which to judge people, even though I still don’t know precisely (14) a "good heart" is. But I know the times I don’t have one myself.
He has (15) gone many years now, but I think (16) him often. I wonder if he sensed my reluctance to be seen with him during our (17) . If he did, I am (18) I never told him how sorry I was, how unworthy I was, how I regretted it. I think of him when I complain about trifles, when I am (19) of another’s good fortune, when I don’t have a "good heart".
At such times I put my hand on his arm to regain my (20) , and say, "You set the pace, I will try to adjust to you.\

题型:单项选择题

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