如图所示，一滑块从底端冲上固定的足够长粗糙斜面，到达某一高度_爱下问搜题

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问题选择题

如图所示，一滑块从底端冲上固定的足够长粗糙斜面，到达某一高度后返回。下列各图分别表示滑块在斜面上运动的位移s、速度v、加速度a、机械能E随时间变化的图像，可能正确的是

答案

BC

题目分析：滑块在斜面上做变速运动，所以位移图像不是直线，而是曲线，A错；物体向上运动时，做匀减速运动，向下运动时，做匀加速运动，B正确；且有向上运动时的加速度大于向下运动时的加速度，（）加速度方向相同，都沿斜面向下，C正确；因有阻力做功，整个过程机械能减少，D错。

完形填空

I had a job interview this morning at 10:30 in a place which was quite far from my house.
I had asked my brother to_   ___me at the bus stop. But he was running late and it was already 9:45 before I reached the bus stop.__   __, I caught my first bus and had to wait at another stop for the second one.
Then, in front of my__   __, a little girl (who may have been a beggar) was hit by a car!The car drove off without__   __. The girl was badly hurt in her hands and legs. She was _   ____heavily and was screaming in pain. After a few seconds she fainted(昏厥).
People standing nearby didn’t seem to know_   ___ to do. I ran over and called for an auto. A_   ____, who seemed to be the girl’s grandpa, ran towards us with _  ____steaming down his cheeks. I took them both to ______ in the auto. They admitted the girl and _   ___ to start her treatment. Happily, she was well__   ___ and soon came back to consciousness. She smiled at me and hugged her grandpa. I _   ____ the bill, gave them a little money, then I __   ___ for my interview.
It was 1:30p.m. Before I got home. I was __   __hours late! The one interview who was still there asked what had__   __ me. I told him, and then gave him one of our Smile cards and _   ____ about the project. He was very impressed!
It would be __   ___ to say I got the job.      ___, because I was so late he could not pass me on to the next level.
Getting the job might have made me happy, but helping that young girl and her grandpa made me even __   ____! I really thank God for giving me that__   ___ to help.

C．Surprisingly

A．cared about

B．looked after

D．carried out

D．unbelievable

B．opportunity

单项选择题

根据SOLAS公约，油船、化学品液货船、气体运输船应配备（）。

A.耐火救生艇

B.全封闭救生艇

C.自由降落式救生艇

D.轻型玻璃钢救生艇