为了探究真空能否传声，小明设计了如图所示的几个实验。你认为能_爱下问搜题

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问题选择题

为了探究真空能否传声，小明设计了如图所示的几个实验。你认为能够完成探究目的的是 [ ]

A．

B．

C．

D．

答案

答案：B

填空题

用方框中所给词的正确形式填空。

angry well song hope also relax think
tired clean when finger medicine

     I am a doctor. People often come to see me because they have colds or coughs. People   1 come
to see me because they are sad or nervous. Sometimes   2 helps. Sometimes talking helps. But many
doctors   3 that music can help people feel better. I asked a few of my patients how music helps them.
       "Sometimes I was   4 when I was a child. My family said, 'Play your feelings on the piano!' Sometimes
I play a loud  5 on the piano. Soon I feel calm. I can laugh and cry through my   6 on the piano. It's natural
for me. It's like breathing (呼吸)."
        "Listening to music helps me feel  7 . I like to listen to music and dance when I   8 my house."
        "I play the violin. I like playing at night   9 it is quiet. After playing I am tired and I am happy. I always
sleep  10 after playing my violin."
        Are you a musician? Good! Keep playing. If you are not a musician, listen to music and sing or dance.
It's good medicine.

填空题

金属脚手架与35kV带电架空线路沿水平方向的最小安全距离是（）m。