A:统一国内市场
B:消除外国势力的控制
C:镇压人民革命力量
D:废除奴隶制度
—Someone helps you when you are in trouble. What should you say to them?
—I say “________” to them.
以下各组风带中,风向基本相同的是 ( )
用方框中所给的词填空
cold education postman heat full-time
如图所示,动滑轮重0.5N,物体重3.5N,当OA=2OB时,为使轻质杠杆保持水平平衡、在A端所加的力应为(不计摩擦)( )