下列哪项不是人们最佳睡眠时间()
A.子时
B.丑时
C.巳时
D.寅时
E.卯时
参考答案:C
The financial crisis has put the world economy in a difficult . [ ]
A. occasion
B. condition
C. evaluation
D. situation
蓄能器是()和()液体压力能的装置。