垂直距离等于息止颌位垂直距离减去A．1mm B．2~4mm C．5~6mm D

How to keep healthy? It’s easy for us to catch a cold in winter and spring because the weather changes a lot in spring and it is too cold in winter. But if we take care in our life, all of us can keep healthy without any cold.

 小题1: This will stop germs（细菌,病毒） passing from one person to another. When you finish your work or before you eat, you’d better wash your hands. 小题2: . Use a tissue（纸巾）, and then throw it into dustbins at once. When others around you are coughing, I advise you to turn your head away from the people so that their viruses won’t reach you. Get more fresh air. Germs like staying around in dry and warm rooms. 小题3: . Don’t stay too long in the places with too many people.

If flu is going round house or school, you should try to stay away from those who are ill.小题4:   

Boil your toothbrush for about a minute. This kills germs. 小题5:. If you have used the toothbrush for three months or so, throw it away and buy a new one.

A．Have a shower every day

B．Wash your hands often

C．Don’t use your hands when coughing

D．Don’t go out often when you are coughingE. Besides, don’t use the same toothbrush too long

F. In this way, you won’t be infected by these people

G. So you’d better stay in the places with more fresh air.

当机械通风系统采用部分循环空气时，送入工作场所空气中有害气体、蒸汽及粉尘的含量，不应超过规定接触限值的（）。

下列产品哪个没有运用到淀粉的老化性质？（）

A、速煮米饭

B、粉丝

C、油炸方便面

D、淀粉糖浆

资产管理公司商业化收购的范围是（）的不良资产。

A.境内外金融机构

B.境内金融机构

C.境内银行业金融机构

D.国有商业银行

手枪式电钻工作电压为220伏，一般用来钻（）毫米以下的孔。

A.6

B.10

C.13