皮皮学，免费搜题
登录
搜题
【单选题】
据英国《自然》杂志网站2月5日报道,美国科学家使用特殊的催化剂,在阳光下将水变成了可燃的甲烷,这让饱受能源枯竭威胁的人类看到了希望。帮助他们完成这一转化的是一个小小的二氧化钛( TiO 2 )纳米管。科学家们用这种纳米管催化水蒸气和二氧化碳,结果得到了甲烷(一种碳氢化合物,是天然气、沼气、煤气等的主要成分)。则下列说法中错误的是A.
从化学原理上讲，这一反应没有违背质量守恒定律
B.
甲烷是一种有机物，它能在空气中燃烧
C.
二氧化钛是一种金属氧化物，反应前后它的质量不变
D.
这一反应是一个化合反应
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Cox Radio, one of the nation's largest radio chains, plans to ______ its ties with independent record promoters to distance itself from a payola-like practice that runs rampant in the music business.
A.
consolidate
B.
tout
C.
sever
D.
splash
【单选题】Parents shouldn’t be too ______________ towards their children; they should let them be more independent.
A.
genuine
B.
protective
C.
close
D.
outspoken
【单选题】听力原文：M: The family who controls the business feels that the firm will lose its independence if that big international company take, it over. W: I understand that many of the stockholders are upset by ...
A.
The news about the firm is not true.
B.
The international company will get control of the family firm.
C.
Stockholders are spreading rumors.
D.
The family firm will not lose its independence.
【单选题】The ______ colonies, which settled along the east coast, issued the Declaration of Independence in
A.
13...1776
B.
14...1774
C.
13...1775
D.
14...1776
【单选题】78% of group tour travellers and 51% of (5) travellers were from countries
A.
group
B.
independ
C.
independent
相关题目：