皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【简答题】
、某校生物兴趣小组为了了解“骨的成分与特性之间的关系”，设计了如下所示的实验，请回答以下问题 ⑴骨的煅烧试验 ①用镊子夹住一小段鱼肋骨放在酒精灯上持续煅烧，观察鱼骨先变黑，后变红，最后变成 色。 ②用镊子轻轻敲打煅烧后的骨，骨碎裂。 ③实验结论：骨中含有 ，它使骨具有 的特点。 ⑵儿童、青少年时期骨内的有机物含量的百分比相对于老年人来讲要 ，所以骨容易 ，要注意体育锻炼，注意坐立行的姿态。
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
【简答题】Since this chemical 1 of the carbon component occurs entirely in the solid state, the resulting structure is a fine mechanical 2 of ferrite and cementite. 3 prepared by polishing and etching in a we...
查看完整题目与答案
【多选题】For the solution for displacements of statically indeterminate structure, which statement is correct?
A.
This displacement formula still work.
B.
The primary structure set up for the calculation of desired displacement should be the same one that has been used to determine internal forces in the original structure.
C.
The primary structure set up for the calculation of desired displacement don't need to be the same one that has been used to determine internal forces in the original structure.
D.
We can choose any primary structure for the original structure to calculate the desired displacement because all primary structures have the same internal forces and displacement with the original structure's.
查看完整题目与答案
【单选题】A medical student is attempting to understand the buffering system of the human body and has set up the following experiment in the lab to help with his understanding. Consider a biochemical reaction ...
A.
7.59
B.
7.25
C.
7.22
D.
7.20
E.
7.15
查看完整题目与答案
【简答题】Home-made parts are being ________ for imported ones.
查看完整题目与答案
【单选题】What is the text structure of this paragraph? Pay attention to the clue words. Park School had a terrible problem. Every day at recess, students would argue over the slides. Teachers had to spend time...
A.
Compare and contrast
B.
Problem and solution
C.
Cause and effect
D.
Chronological order
E.
Main idea and details
查看完整题目与答案
【判断题】Elementary row operations on an augmented matrix never change the solution set of the associated linear system.
A.
正确
B.
错误
查看完整题目与答案
【判断题】The solution set of a linear system involving variables x1; : : : ; xn is a list of numbers .s1; : : : ; sn/ that makes each equation in the system a true statement when the values s1; : : : ; sn are ...
A.
正确
B.
错误
查看完整题目与答案
【简答题】Lenovo's Integrated Distribution Channels, Whether the Solution of Bureau of Mystery? In the mainland market of China, dealing with the relationship between the dealers has always been a great headach...
查看完整题目与答案
【单选题】The solution set of which of the following equations is the set of real numbers that are 5 units from -3 ?
A.
∣x+3∣=5
B.
∣x-3∣=5
C.
∣x+5∣=3
D.
∣x-5∣=3
E.
∣x+5∣=-3
查看完整题目与答案
【单选题】"catach-22" meaning "A situation in which a desired outcome or solution is impossible to attain because of a set of inherently illogical rules or conditions" is from the title of the novel "Catch-22"....
A.
analogy
B.
commonization of proper names
C.
acronymy
D.
reduplication
查看完整题目与答案
相关题目：
【简答题】Since this chemical 1 of the carbon component occurs entirely in the solid state, the resulting structure is a fine mechanical 2 of ferrite and cementite. 3 prepared by polishing and etching in a we...
查看完整题目与答案
【多选题】For the solution for displacements of statically indeterminate structure, which statement is correct?
A.
This displacement formula still work.
B.
The primary structure set up for the calculation of desired displacement should be the same one that has been used to determine internal forces in the original structure.
C.
The primary structure set up for the calculation of desired displacement don't need to be the same one that has been used to determine internal forces in the original structure.
D.
We can choose any primary structure for the original structure to calculate the desired displacement because all primary structures have the same internal forces and displacement with the original structure's.
查看完整题目与答案
【单选题】A medical student is attempting to understand the buffering system of the human body and has set up the following experiment in the lab to help with his understanding. Consider a biochemical reaction ...
A.
7.59
B.
7.25
C.
7.22
D.
7.20
E.
7.15
查看完整题目与答案
【简答题】Home-made parts are being ________ for imported ones.
查看完整题目与答案
【单选题】What is the text structure of this paragraph? Pay attention to the clue words. Park School had a terrible problem. Every day at recess, students would argue over the slides. Teachers had to spend time...
A.
Compare and contrast
B.
Problem and solution
C.
Cause and effect
D.
Chronological order
E.
Main idea and details
查看完整题目与答案
【判断题】Elementary row operations on an augmented matrix never change the solution set of the associated linear system.
A.
正确
B.
错误
查看完整题目与答案
【判断题】The solution set of a linear system involving variables x1; : : : ; xn is a list of numbers .s1; : : : ; sn/ that makes each equation in the system a true statement when the values s1; : : : ; sn are ...
A.
正确
B.
错误
查看完整题目与答案
【简答题】Lenovo's Integrated Distribution Channels, Whether the Solution of Bureau of Mystery? In the mainland market of China, dealing with the relationship between the dealers has always been a great headach...
查看完整题目与答案
【单选题】The solution set of which of the following equations is the set of real numbers that are 5 units from -3 ?
A.
∣x+3∣=5
B.
∣x-3∣=5
C.
∣x+5∣=3
D.
∣x-5∣=3
E.
∣x+5∣=-3
查看完整题目与答案
【单选题】"catach-22" meaning "A situation in which a desired outcome or solution is impossible to attain because of a set of inherently illogical rules or conditions" is from the title of the novel "Catch-22"....
A.
analogy
B.
commonization of proper names
C.
acronymy
D.
reduplication
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