如图所示，P是水平地面上的一点，A、B、C、D在一条竖直线上，且A

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问题选择题

如图所示，P是水平地面上的一点，A、B、C、D在一条竖直线上，且AB=BC=CD，从A、B、C三点分别水平抛出一个物体，这三个物体都落在水平地面上的P点，则三个物体抛出时速度大小之比为v_A:v_B:v_C=

[ ]

C.1:2:3

D.1:1:1

答案

答案：B

阅读理解

阅读短文，判断下列句子的正误，与短文内容相符的在括号中写"Y"，不相符的写"N"。

Hello, I'm Lucy. I have got a bike. I go to school by bike. My mother has got a bike, and she goes to

work by bike, too. My father has got a car. He goes to work by car. This is Ms Li. She is my English

teacher. She walks to school.

( ) 1. Lucy walks to school.

( ) 2. Her father goes to work by taxi.

( ) 3. Her mother has got a bike.

( ) 4. Ms Li goes to school by bus.

单项选择题

甲酸盐钻井完井液体系的密度范围为（）。

A.1.07~1.35g/m³

B.1.38~2.30g/m³

C.1.80~2.30g/m³

D.1.38~3.00g/m³