输出功率因数用来衡量UPS电源对感性、()、等非线性负载的驱动能力。
A、逆变
B、容性
C、大型
D、小型
参考答案:B
当一组数据的个数为偶数时,这一组数据就没有中位数.______.(判断对错)
The companies are working together to create________ they hope will be the best
means of transport in the 21st century. [ ]
A. which
B. that
C. what
D. who