如图所示，有一个人站在超市的自动电梯（斜面电梯）上，若人和电梯一起斜向下匀速运动，则电梯对此人的作用力为（）_刷题宝

题干

如图所示，有一个人站在超市的自动电梯（斜面电梯）上，若人和电梯一起斜向下匀速运动，则电梯对此人的作用力为（）

A：0

B：竖直向上

C：垂直电梯斜面向上

D：沿电梯斜面向上

上一题下一题 0.0难度选择题更新时间:2019-11-13 10:49:55

答案(点此获取答案解析）

B

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新中国外交政策成熟的标志是

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一个合数至少有（）个因数．

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Δ A B C

A

B

C

的对边分别为

a

b

c

\frac{sin A}{k} = \frac{sin B}{3} = \frac{sin C}{4}

k

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通读下面的短文，掌握其大意，然后从各题所给的A、B、C三个选项中选出一个最佳答案。

There is a zoo in my town. I often go there with my parents by 1 on the weekend. It usually takes my father about 2 minutes to drive there. We often leave home at about eight and 3 there at about twenty past eight.

I like many kinds of animals, but I like4 best. First, they are verycute. Second, they are friendly, and they are one of China's 5. but now pandas are in great danger, so we must 6 them.

Now, I'm watching the two pandas in the zoo. I 7 want to go near and play with them. 8 I also want to give them some food. But 9 the rules in the zoo:

1. Don't go near tothe animals.

2. Don't give10 to the animals.

To make animals live a happy life, everyone needs to follow the rules.

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