质量为2kg的铅球正在空中飞行（若不考虑空气的阻力），那么此铅球只受到_____

下面Ⅰ栏是中学生要注意的五种安全隐患，Ⅱ栏是五个可供详细解释或解决的方案。请根据内容将他们进行配对，并将其字母编号填写在相应的序号后面。

Ⅰ

小题1:Running after each other at the rest time between two classes may get you hurt.

小题2:Making a fire in the bedroom is very dangerous.

小题3:When you get angry with anybody, you fight against him. This is not good at all.

小题4:If you go to swim in the river nearby without your teacher’s permission, you will be in danger.

小题5:Riding a bike inside the school fast is regarded as one of the dangerous things at school.

Ⅱ

A．Some students die in this way. Without their teacher or parents nearby, they may not know how to do with dangerous things they meet in the river.

B．When class is over, you should have a short rest both inside your classroom or outside your classroom. You can’t run here and there.

C．Because you may burn things inside your bedroom and even be killed by the fire.

D．If you go home by bike, please push it instead of riding inside the school until you are on the road outside your school.E. Any classmates are your friends. Even if you can’t agree with everything, you don’t need to quarrel or fight. You should learn how to get along well with others.

对该患者的护理措施正确的是

A．避免各种诱发因素

B．患者绝对卧床1～2周

C．禁用止痛剂，以免遮盖病情

D．血压变化可不作为观察重点

E．可多次大量放脑脊液，减轻脑膜刺激征

（）是指人与人之间相互交往、相互作用、相互满足的状态。

A.人际关系

B.相互沟通

C.相互协调

D.人际交往

化合价反映形成化合物时，各元素的原子之间的个数关系。

不要戴玻璃或隐形眼镜，去掉口袋内的尖锐的物品。（）