皮皮学，免费搜题
登录
搜题
【简答题】
在没有催化剂存在时，H2O2的分解反应H2O2(l) = H2O (l) + 1/2O2(g)的活化能为75 kJ mol-1。当有铁催化剂存在时，该反应的活化能就降低到54 kJ mol-1。在298K时此两种反应速率的比值为 。
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】Welcome aboard Sir! I'm the purser of the first class today. You may call me Alex. How should I _________ you during the flight?
A.
speak
B.
say
C.
address
D.
articulate
【简答题】表示算术关系12<=x<=y的C语言表达式为。A. ( 12 <=x ) &( x <=y )B. ( 12 <=x ) || ( x<=y )C. ( 12 <=x )&& ( x <=y )D. ( 12 <=x) | ( x<=y )
【简答题】A. Read the sentences and do the crossword. The flight served us coffee after lunch. There was a lot of during our flight. It was scary! That's it! I'm never wearing these shoes again. They're very . ...
【单选题】Many passengers _________ to sleep during the flight rather than watch the movie or listen to the music.
A.
listen to
B.
equipped
C.
operated
D.
prefer
E.
plug…into
F.
as to
G.
delivered
H.
locate
I.
transmitted
J.
called upon
【单选题】表示算术关系12<=x<=y的C语言表达式为：选择一项：< /div>
A.
( 12 <= x ) || ( x <=y )
B.
( 12 <= x ) && ( x <=y )
C.
( 12 <= x) | ( x <=y )
D.
( 12 <= x ) & ( x <=y )
【单选题】下面有关计算机操作系统的叙述中,错误的是
A.
操作系统属于系统软件
B.
Windows是一种操作系统
C.
计算机的处理器、内存等硬件资源也由操作系统管理
D.
操作系统只负责管理内存储器，而不管理外存储器
【简答题】编程输入一个字符串(至少10个字符),并指定要删除的字符后,把字符串中所有指定字符删除并输出剩余的字符串,如输入"abbcde",指定删除字符b,则输出"acde"。要求输入、删除和输出分别在不同函数中完成。
【多选题】I. Replace the italicized parts in the following sentences with words or expressions from the text. 1.Usually, passengers may purchase duty free items for a limited span of time during the flight. （可有...
A.
phase
B.
period
相关题目：
【单选题】表示算术关系12<=x<=y的C语言表达式为：选择一项：< /div>
A.
( 12 <= x ) || ( x <=y )
B.
( 12 <= x ) && ( x <=y )
C.
( 12 <= x) | ( x <=y )
D.
( 12 <= x ) & ( x <=y )