五一快到了,假如你们全家打算在五一假期外出旅游,你们都在为外...

My family plans to go on a vacation on May Day.We plan to go to Qingdao and have fun at the beach.My mom is buying sunglasses for everyone.She is making sure that we will have enough sunscreen.My dad is making a plan about what we will do each day.I am preparing my own luggage.I am putting my clothes and swimming suit in.需要中文请和我说

...假如你们全家打算在五一假期外出旅游,你们都在为外出旅游做准...

My family plans to go on a vacation on May Day.We plan to go to Qingdao and have fun at the beach.My mom is buying sunglasses for everyone.She is making sure that we will have enough sunscreen.My dad is making a plan about what we will do each day.I am preparing my own luggage.I am putting my clothes and swimming suit in.

外出旅行带什么消毒剂安全？快到五一小长假了,全家准备出去旅游,...

A、挤牙膏时，手对牙膏一个力的作用，结果牙膏的形状发生了变化，这表明力可以改变物体的形状，故A正确；B、摩擦力大小与压力大小和接触面粗糙程度有关.牙膏盖上的条纹，增大了与手之间的粗糙程度，从而增大了摩擦，故B正确；C、图中所示牙膏净含量是3g，所以新的整支牙膏质量大于3g，则受到的重力大于0.03N，所以C错误；D、压强大小与压力大小和接触面积有关.尖锐物的一端非常细，这样可以减小受力面积，从而增大它对牙膏的压强，故D正确.故选 C.