A:如果物体所受的合外力为零,那么,合外力对物体做的功一定为零
B:如果合外力对物体所做的功为零,则合外力一定为零
C:物体在合外力作用下做变速运动,动能一定变化
D:物体的动能不变,所受的合外力必定为零
阅读下面短文,将短文中画线部分的句子翻译成中文 How Much Water Is Needed a Day? Many people think they should drink eight glasses of water a day.Why? Because that is what they have been told all their life.But a new report on science gives some different suggestions:people should drink according to their bodies.____ They should drink as much water as they would like to drink. The report says most people meet their daily needs for water by letting thirst be their guide.It also gives people some good suggestions:women should get about 2.7 liters(升)of water every day,while men should get about 3.7 liters. There is an important difference.____ The report doesn’t tell people how many glasses of water to drink.Instead,the experts say it may not be possible to know how many glasses people really need.This is because the daily want of water can include the water in foods.
你那里休道我言语多诈,你本是大义人把事作差。吕伯奢与你父相交不假,谁叫你起疑心杀他的全家?一家人俱丧在宝剑之下,出庄来杀老丈是何根芽?