皮皮学，免费搜题
登录
搜题
【多选题】
对于当前观测来说,下列对宇宙中各种成分占比的描述正确的是A.
暗能量约占70%
B.
重子物质约占10%
C.
辐射约占5%
D.
暗物质约占25%
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】Consider the demand curve Q d = 50 − 2 P + 3r . If the value of r falls, the demand curve will:
A.
shift to the right.
B.
shift to the left.
C.
remain unchanged.
D.
rotate along the quantity axis.
【单选题】The following data relates to questions 13 and 14. The wholesale price index is made up from the prices of three items. More information is as follows.Item Quantity Price per unit Quantity Price per u...
A.
117.2
B.
119.3
C.
126.8
D.
120.4
【简答题】滑动螺旋传动的主要失效形式是______，故通常根据旋合螺纹间的______条件确定螺杆的______和螺母______。对其他可能发生的失效形式也相应进行校核螺杆的______、螺母螺纹牙的______以及______条件和______性。
【简答题】C ompany MMY of China exported 1,000 fans to America. Partial shipments are not allowed according to the credit. However, when the seller made the shipment, he found 40 fans with broken package, some ...
【单选题】Use the following general linear demand relation to answer the following questions: where M is income and Pr is the price of a related good, R . If M = $15,000 and Pr = $20 and the supply function is ...
A.
P = $55 and Q = 195.
B.
P = $6 and Q = 38.
C.
P = $12 and Q = 200.
D.
P = $50 and Q = 170.
【单选题】M(r, s, t) denotes the average (arithmetic mean) of r, s, and t, and M (x, y) denotes the average of x and y. Column A Column B M (70, 80, 90) M (x, 90) where x = M (70, 80)
A.
if the quantity in Column A is greater
B.
if the quantity in Column B is greater
C.
if the two quantity are equal
D.
if the relationship cannot be determined from the information given
【简答题】滑动螺旋传动的主要失效形式是 .
相关题目：
参考解析：
知识点：
题目纠错 0
发布
