皮皮学，免费搜题
登录
搜题
【单选题】
已知H 2 O(g) H 2 O(l) ΔH=Q 1 kJ·mol -1 C 2 H 5 OH(g) C 2 H 5 OH(l) ΔH=Q 2 kJ·mol -1 C 2 H 5 OH(g)+3O 2 (g) 2CO 2 (g)+3H 2 O(g) ΔH=Q 3 kJ·mol -1 若使23 g液体酒精完全燃烧，最后恢复到室温，则放出的热量为__________kJ（ ）A.
Q 1 +Q 2 +Q 3
B.
0.5(Q 1 +Q 2 +Q 3 )
C.
0.5Q 1 -1.5Q 2 +0.5Q 3
D.
1.5Q 1 -0.5Q 2 +0.5Q 3
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
【简答题】幼儿期的运动技能主要表现为两大方面，一是手部的精细运动技能，另一是_________。
【单选题】已知产品销售单价为 24 元,保本销售量为 150 件,实际销售额为 4800 元,则安全 边际率为
A.
0.33299999999999996
B.
0.25
C.
0.5
D.
20%
【单选题】Tests Show Women Suited for Space Travel Between 1977 and 1981, three groups of American women, numbering 27 in all, between the age of 35 and 65, were given month-long tests for space travel purposes...
A.
At the end of ten years, they had to spend a further twenty days absolutely confined to bed.
B.
They were volunteers and were paid barely above the minimum wage.
C.
These tests were conducted to determine how they would respond to conditions resembling those abroad the space shuttle.
D.
They need less food and less oxygen and they stand up to radiation better.
E.
Some of them were over 65.
F.
When they were finally allowed up, the more physical active women were specially subject to pains due to a slight calcium (钙)loss.
【简答题】在WeX5中,若数据信息来自JSON文件,则需要使用( )组件,若数据信息来自数据库,则需要使用( )组件。若在页面中需要加入标题栏,则需要使用( )组件。
相关题目：
【单选题】已知产品销售单价为 24 元,保本销售量为 150 件,实际销售额为 4800 元,则安全 边际率为
A.
0.33299999999999996
B.
0.25
C.
0.5
D.
20%