题干

如图洗衣机的甩干筒在转动时有一衣物附在筒壁上,则此时(  )

A:衣服受到重力、筒壁的弹力、摩擦力和向心力

B:衣服随筒壁做圆周运动的向心力是摩擦力

C:筒壁的弹力随筒的转速的增大而减小

D:靠近中心的衣物脱水效果不如四周的衣物脱水效果好

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答案(点此获取答案解析)

D

同类题5

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空。

    There are more foreign companies, varieties of food from different regions of the world, and I can see more artists and exhibitions from different countries coming to Shanghai.

    “Living in Shanghai means living on the edge of China's future and ____ (move) the speed of light,” one of my friends told me.

    “Get used to the speed. It makes New York feel slow.”

    Meanwhile, I am making friends from all over ____ world. My British friends share their Chinese experiences with me when we have afternoon tea at Sinan Mansions. Sometimes, I share my adventures ____ Russia with my American friends. We ____(attract) by global culture and ideas.

    I still remember the first time I met one of my best friends, Hans from Belgium. When he knew where I came from, he ____ (sudden) spoke in the Wenzhou dialect.

    That shocked me. He told me ____ he had many friends from Wenzhou, ____ he can speak a little “Wenzhou hua (dialect of Wenzhou)”.

    I love Shanghai because I had my best experiences since my school days. I like____ history and architecture. The cultural diversity and the high-speed development of Shanghai are even ____ (astonishing). The most important thing is that I am excited to know and understand more about my hometown ____I live in Shanghai. What a fantastic city!