—_____do you like your clothes?
—They are too short. [ ]
A. How
B. Which
C. Who
D. What
答案:A
The poem is hard to understand. Can you make ____ of it? [ ]
A. idea
B. difference
C. sense
D. understanding
计算题:某日上午10点无功负荷为Q=556MVar,有功P=1685MW,求:该点的发电力率即cosφ=?