A.能量守恒原理B.動(dòng)量守恒定律C.質(zhì)量守恒原理D.帕斯卡原理
A.??;遠(yuǎn)離 B.?。豢拷?br /> C.大;靠近
A.2°或5° B.1°和3° C.2°和4° D.5°和10°