题干

 如图,小明用一轻质杠杆自制简易密度秤的过程中,在A端的空桶内分别注入密度已知的不同液体,改变物体M悬挂点B的位置,当杠杆在水平位置平衡时,在M悬挂点处标出相应液体的密度值.下列关于密度秤制作的说法中,错误的是(  )

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A:每次倒入空桶的液体体积相同

B:秤的刻度值向右越来越大

C:悬点O适当右移,秤的量程会增大

D:增大M的质量,秤的量程会增大

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答案(点此获取答案解析)

C

同类题3

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    Please sit down and enjoy your meal. Just don't talk about it.

    These are the requirements at a popular dining party that is known as "silent dinners". It encourages people who take part in the dining party not to speak for one to two hours and not to use electronic devices. Instead, the idea is to just on the food.

    "Silent dinner parties are fast growing," said Honi Ryan, who has hosted 32 silent dinner parties in 11 cities across eight countries, including Germany, Australia andthe United States. "The way we communicate is changing so fast that we need to stop and think about it."

    According to a 2013 nation wide survey, restaurant noise came in second only to poor service among customer(顾客) complaints. And 19 percent of diners who took part in the survey said noise and crowds disturbed them most while eating out.

    Though silent dinners may seem curious, the idea is not a new one. Yogis(瑜伽信徒) have long enjoyed silent meals as part of a deepened practice. In fact, it was a trip to a temple(寺庙) in India by a man that encouraged one Brooklyn restaurant recently to add a silent dinner to its event programming.

    "We'll make a small speech at the beginning of the meal to make sure everyone understands what is happening and ask them not to speak or use their mobile phones for at least an hour," said EAT Green point owner Jordan Colon. And background music will be turned off, too.

    "It's funny; when I first opened EAT, I didn't play music for some time and people had very different reactions(反映) to that," said Colon. "Some people who come out to eat are ready to party, but it was so quiet without music. But I wanted to create an environment that makes you relaxed."

    Although personal reactions to a silent dinner may be various, in general they are more likely to get into a lot of talk afterwards, said Ryan. "At the end of the night people always have a lot to say about silence. But the most reaction is that there is always a good laugh."