在日本的武装倒幕运动中( )
A:商人、资本家和新兴地主成为领导力量
B:中下级武士积极参加了斗争
C:明治政府进行了一系列资产阶级性质的改革
D:伏见、鸟羽战役彻底消灭了幕府武装力量
若a,b∈R,且ab>0,则下列不等式中,恒成立的是 ( )
Sam has got a bike. He goes to school by bike. Amy hasn't got a bike. Her father has got a car. She goes to school in her father's car. Daming hasn't got a bike. He goes to school by bus.
下列关于呼吸系统的说法,错误的是( )
下面四个式子可以表明非0自然数a<b的是( )