如图所示，物体A、B、面之间的接触面均为粗糙平面．在水平拉力F的作用下，A、B、C一起向右作匀速直线运动．下列有关说法正确的是（　　）

选词填空。

    Many people want others to be their friends，but they don't give friendship back．That's why some friendships don't____very long．You really want other people to be your fiends，right? Well，you'd better know the following things．Friends must trust each____，So being honest(诚实的)is very important．If a friend finds out that you are not honest，you may lose your friend's ____．

    To be a good friend，you must learn to____．You don't have to give your lunch money or your clothes to your friend．But you need to learn how to share things you enjoy,like your____or interests．Certainly,you can also share your ideas and feelings．These can be very____to a friend．By sharing them you help your friend know you much____．

    At school，something may go____．Talking about the problem can help you____it easily．Turning to a friend can be a first choice to solve the problem．So to be a friend, you____listen and understand．You must try to put yourself in your friend's place，So you can understand the problem better.

沪昆高速铁路是我国“四纵四横”的快速客运通道之一，预计于2016年全线通车。读沪昆高铁客运专线图。

量出下面每个角的度数，再填出各是什么角。