Lana told Marcia she would go to her house ______ Friday night. [ ]
A. at
B. on
C. in
答案:B
△ABC的周长为60,∠A和∠B的平分线相交于点P,若点P到边AB的距离为10,则△ABC的面积为______.
TETRA系统中,()有传输7.2kb/s的数据。
A.控制信道
B.业务信道
C.线性化信道
D.信令信道