在分离均衡的境况中，高能力者一定好于没有信号发送。
参考答案：错
—How's your weekend, Jack?
—I spent all time _____ my friends. But sometimes I spend time _____ the internet. [ ]
A. on, on
B. in, with
C. with, on
D. on, with
同时承受径向力和轴向力的轴承是（）
A.径向接触
B.轴向接触
C.角接触轴承
