如图所示，细绳竖直拉紧，小球和光滑斜面接触并处于静止状态。关于小球受力情况的说法中，正确的是（）

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A：小球受到重力和绳的拉力

B：小球受到重力、绳的拉力和斜面的弹力

C：小球受到重力和斜面的弹力

D：小球只受到重力的作用

上一题下一题 0.0难度选择题更新时间:2016-02-25 07:57:56

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A

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Dear friend,

My name is Erick. I am 12. My birthday is on October 12 th. I am from America. I'm in Class 3, Grade 7. We are learning Chinese in our school. Our Chinese teacher's name is Wang Hao.

Here are some of my friends. Jimmy is tall and he has black hair. He is good at playing basketball. He is a member of the Basketball Club. May is short and she wears glasses and a yellow dress. She likes English very much and speaks English very well. Sally is a black girl. She has short hair. She likes swimming. She swims best in the swimming team. I like music. I'm the boy with glasses.

Yours,

Erick

Erick's____
Names	Appearance(外貌)	____
Jimmy	He has____hair and is tall.	He is a____of the Baketball Club.
May	She____ glasses and a yellow____.	She can speak English very____.
Sally	Her hair is____.	She likes____. She is a very good____.

纯净物	乙醇	氧气	二氧化碳	水	X
反应前质量/g	2.3	4	0	0	0
反应后质量/g	0	0	2.2	2.7	待测

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