已知函数y=-x+5,y=4x,它们的共同点是:①函数y随x的增大而增大;②都有

题型:选择题

问题:

已知函数y=-x+5,y=
4
x
,它们的共同点是:①函数y随x的增大而增大;②都有部分图象在第一象限;③都经过点(1,4),其中正确的有(  )
A.3个B.2个C.1个D.0个
考点:一次函数的定义反比例函数的性质
题型:选择题

用come短语的适当形式填空。

1. The school has very good teachers, but when it ____ buildings, the school is poor.

2. The teacher asked a difficult question, but finally a boy student ____ a good answer.

3. He is not rich; his earnings ____ only $6,000 a year.

4. My grandpa was so lucky to ____ the operation on his heart.

5. My uncle promised to ____ and fetch me.

6. Christmas will soon ____.

7. That magazine ____ once a week.

8. How did the movie finally ____? I couldn't wait to see the ending.

题型:选择题
3000÷5=300×4=400÷8=240÷4×2=
0÷5=480÷6=2800÷7=0÷5+5=
278÷7≈37×8≈1605÷8≈362÷4≈
题型:选择题

下列实验操作正确的是(  )

A.

检验H2的纯度

B.

Fe在O2中燃烧

C.

排水法收集H2

D.

干燥O2

题型:选择题

当不慎有大量Cl2逸出污染周围空气时,可以用浸有某种物质的一定浓度的水溶液的毛巾捂住鼻子,该物质适宜采用的是(  )

A.NaOH

B.NaCl

C.HCl

D.Na2CO3

题型:选择题

当消费者购买来自于另一行业的替代产品或者服务的“品牌转换成本”越低,替代品对这个行业未来利润的威胁就越大,行业风险也就越大。( )

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