皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【简答题】
用适当的语言或化学用语填空 （1）我国古代一些书法家、画家用墨（用炭黑等制成）书写或绘制的字画能够保存很长时间而不变色，这是因为单质碳具有 。 （2）金刚石与石墨物理性质有很大差别的原因是 。 （3）化学反应前后肯定没有发生改变的是 （填序号）。 ①原子的数目；②分子的数目；③的种类；④物质的总质量；⑤物质的种类；⑥原子的种类 （4）两个氮气分子 （化学用语）（5）碳酸根离子 （化学用语） （6）C 60 是由 构成的。一氧化碳和二氧化碳组成相同，但性质不同的原因 。 （7）频发的雾霾天气催热了防PM2．5专用口罩的网上销售，医生指导晨练爱好者雾霾天最好待在家里，若要外出必须戴好口罩。常用的三种口罩孔径如下：①普通16层纱布口罩在100微米左右；②单层无纺布口罩在10微米左右；③N95专业口罩在0．1微米左右。则选择更有效的口罩是 （填序号）。佩戴防PM2．5专用口罩的原理与 操作的实验原理相同。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【单选题】听力原文：M: I was wondering if I could take four courses next semester. W: Why don't you choose three instead of four? We already have such a heavy course load. Q: What does the woman suggest the man do? ...
A.
It would be better to choose more.
B.
Three people have taken the course.
C.
The man should attend tile class at three.
D.
Four courses may be too many.
查看完整题目与答案
【判断题】土壤碱解氮 是指 在碱性条件下易水解的土壤氮,是当季作物可利用的 有效 氮源。
A.
正确
B.
错误
查看完整题目与答案
【多选题】Let me present the (follow) evidence for your consideration. It is time to carry a burden or responsibility for others without (let) them know. These goods are returnable if you save the (receive) . I...
A.
following
B.
letting
C.
receipt
D.
to buy
E.
separately
F.
haven't got
G.
cheaper
H.
dangerous
I.
relaxed
J.
be divided
查看完整题目与答案
【简答题】I Fill in the blanks with the words given below. change the form where necessary Receipt convict thrive alert champion Donation provision notify temptation compensation Roast paste rent ...
查看完整题目与答案
【单选题】—Wow, the girl won a million dollars. How lucky! —If I _____ a lottery, I _____ give some of it to charities. [     ]
A.
win, will
B.
won, will
C.
won, would
D.
win, would
查看完整题目与答案
【简答题】Complete the following sentences with the expressions given below. Change the form if necessary. be about to behave oneself take up be in a fix how come 1. Students are going to ____...
查看完整题目与答案
【单选题】The underlined word“it”in the last paragraph refers to__________．
A.
the determination of never being left behind
B.
the memory of being considered a weak boy
C.
the decision of never playing basketball again
D.
the experience of being cut from a sports team
查看完整题目与答案
【多选题】DEM建立的数据源有()。
A.
地形图
B.
遥感影像
C.
野外测量
D.
已有DEM
查看完整题目与答案
【简答题】Fill in the blanks with a suitable preposition or adverb. 1. His role was to drum ___ contributions and donations from friends in big business. 2. The chairman spoke so forcefully that the rest of t...
查看完整题目与答案
【判断题】土壤碱解氮是指在碱性条件下易水解的土壤氮，是当季作物可利用的有效氮源。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】听力原文：M: I was wondering if I could take four courses next semester. W: Why don't you choose three instead of four? We already have such a heavy course load. Q: What does the woman suggest the man do? ...
A.
It would be better to choose more.
B.
Three people have taken the course.
C.
The man should attend tile class at three.
D.
Four courses may be too many.
查看完整题目与答案
【判断题】土壤碱解氮 是指 在碱性条件下易水解的土壤氮,是当季作物可利用的 有效 氮源。
A.
正确
B.
错误
查看完整题目与答案
【多选题】Let me present the (follow) evidence for your consideration. It is time to carry a burden or responsibility for others without (let) them know. These goods are returnable if you save the (receive) . I...
A.
following
B.
letting
C.
receipt
D.
to buy
E.
separately
F.
haven't got
G.
cheaper
H.
dangerous
I.
relaxed
J.
be divided
查看完整题目与答案
【简答题】I Fill in the blanks with the words given below. change the form where necessary Receipt convict thrive alert champion Donation provision notify temptation compensation Roast paste rent ...
查看完整题目与答案
【单选题】—Wow, the girl won a million dollars. How lucky! —If I _____ a lottery, I _____ give some of it to charities. [     ]
A.
win, will
B.
won, will
C.
won, would
D.
win, would
查看完整题目与答案
【简答题】Complete the following sentences with the expressions given below. Change the form if necessary. be about to behave oneself take up be in a fix how come 1. Students are going to ____...
查看完整题目与答案
【单选题】The underlined word“it”in the last paragraph refers to__________．
A.
the determination of never being left behind
B.
the memory of being considered a weak boy
C.
the decision of never playing basketball again
D.
the experience of being cut from a sports team
查看完整题目与答案
【多选题】DEM建立的数据源有()。
A.
地形图
B.
遥感影像
C.
野外测量
D.
已有DEM
查看完整题目与答案
【简答题】Fill in the blanks with a suitable preposition or adverb. 1. His role was to drum ___ contributions and donations from friends in big business. 2. The chairman spoke so forcefully that the rest of t...
查看完整题目与答案
【判断题】土壤碱解氮是指在碱性条件下易水解的土壤氮，是当季作物可利用的有效氮源。
A.
正确
B.
错误
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题