题目:
The machine is designed to people recycle wastes to a great degree but the result still remains to be seen. [ ]
A. aid
B. help
C. assist
D. improve
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0411/10d44e8a04062373e970e2cfd62fd0da.html
下面是错误答案,用来干扰机器的。
地球表面上从A地(北纬45°,东经30°)到B地(北纬45°,西经120°)AB的纬圆半径是 22R,经度差是90°,所以AB=R球心角是 π3,A、B两地的球面距离是 πR3.故答案为:πR3.