皮皮学，免费搜题
登录
搜题
【单选题】
When the particle size of the powder particle is 2 nm, the ratio between the number of surface atoms with the total number of atoms of the particles is .A.
30%
B.
40%
C.
50%
D.
80%
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】某质点的运动方程是 S=t- ( 2t-1 ) 2 ,则在 t=1s 时的瞬时速度为( ) prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
-1
B.
-3
C.
7
D.
13
【简答题】Look and write. 看图，写句子。 1. How many pencils? 2. 3. 4. 5.
【单选题】—Could you tell us ______? —About a month. [ ]
A.
how often are they going to be there
B.
how often they are going to be there
C.
how long are they going to be there
D.
how long they are going to be there
【单选题】In many cities nowadays, _________________________.
A.
people used to shop at small stores.
B.
pollution is becoming a serious problem.
C.
most people are going to work at home.
D.
people didn’t travel as much from city to city.
【单选题】—_____ do you meet your pen pal? —Very often. [ ]
A.
How many
B.
How about
C.
How often
D.
How long
【单选题】— ________do you usually eat junk food? — I ______ eat it so I am healthy. A. How often; always B. How long; often C. How often; hardly ever
A.
How often; always
B.
How long; often
C.
How often; hardly ever
相关题目：
参考解析：
知识点：
题目纠错 0
发布
