安全用具应定期进行绝缘试验,绝缘杆的试验周期为()
A.六个月
B.三个月
C.十八个月
D.十二个月
参考答案:D
明朝时,意大利传教士()来到中国,与徐光启合作翻译了欧几里德的《几何原理》
The investment objective of earning a return on an investment that is at least equal to the inflation rate is called:()
A. capital preservation.
B. current income.
C. capital appreciation.