皮皮学，免费搜题
登录
搜题
【单选题】
根据拉普拉斯以及史瓦西关于黑洞预言的推算，若将太阳压缩成半径为（ ）的球体，它就会变成一个黑洞。A.
3km
B.
3mm
C.
10km
D.
30km
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】有关补体溶血的叙述正确的是（）
A.
缓冲液的种类与补体溶血活性无关
B.
缓冲液pH值增加，补体溶血活性上升
C.
缓冲液离子强度增加，补体溶血活性下降
D.
缓冲液中钙、镁离子增多，对溶血无影响
E.
钙、镁离子对稳定溶血系统无作用
【单选题】Why are the eight coins of euro different in composition, weight, thickness, and milling?
A.
Because each nation wants to keep its characteristics.
B.
Because they are designed by different artists from 8 countries.
C.
Because it will enable the blind to distinguish between them easily.
D.
Because Denmark and other countries want to have their own coins.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
