已知：Rt△ABC中，∠C=90°，cosA= 35 ，AB=15，则AC的长是_刷题宝

题干

已知：Rt△ABC中，∠C=90°，cosA=

3

5

，AB=15，则AC的长是（）

A：3

B：6

C：9

D：12

上一题下一题 0.0难度选择题更新时间:2017-11-07 08:24:54

答案(点此获取答案解析）

C

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用所给词的适当形式填空

1. It's not easy for some students ____(get) to school.

2. Sometimes he gets up late, so he runs____ (quick) to school.

3 . Thanks for ____ (help) me so much.

4 . My uncle is sixty years old. It's his ____ (sixty) birthday today.

5 . Liu Lu ____ (cross) the river on a ropeway every day.

同类题4

．已知命题p：关于

上是增函数.，命题q：

为减函数，若

为真命题，则

的取值范围是（）

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阅读理解

Parents today also worry about their children's diets. Some doctors give the following advice：

Teenagers shouldn't eat too much junk food.

Teenagers shouldn't eat food with too much salt. Salt can cause high blood pressure in the future.

Teenagers should eat food with less fat， oil and sugar.

Teenagers need to eat some fruits and vegetables every day. Fruits and vegetables are rich in vitamins and have little fat.

Teenagers need to drink more milk. Milk will help their bones grow.

Teenagers need to eat breakfast every day. This is good for their bodies and minds.

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