日本是亚洲的发达国家,读图回答各题。
—It's hard for me to fall asleep at night. Could you offer me some advice?
—________________. Tell me all about it and I'll do what I can.
关于摩擦力,有如下几种说法,其中正确的是:( )
①全心全意为人民服务的宗旨
②对党的绝对忠诚
③坚持以经济建设为中心
④以零容忍态度惩治腐败