()是人民警察的活动准则内容之一。
A、纪律严明
B、刚直不阿
C、热情礼貌
D、待人诚恳
参考答案:C
I really don't know how to thank you, but for your help, I ________ my lost necklace.
A.couldn't have found
B.mustn't have found
C.couldn't find
D.wouldn't find
进站及进路色灯信号机应装设()信号.