对在岗期间的职业健康检查，用人单位应当按照《职业健康监护技术规范》（GBZ188）等

烃类蒸汽转化制氢的原料，最适宜选用的烃类是（）。

A．低毒、平均相对分子质量大、饱和烃含量多

B．低毒、平均相对分子质量小、不饱和烃含量多

C．低毒、平均相对分子质量大、不饱和烃含量多

D．低毒、平均相对分子质量小、饱和烃含量多

区别挥发油与油脂常用的方法是

A．相对密度

B．溶解性

C．皂化值

D．油迹实验

E．比旋度

既不是正数又不是负数的数是______．数轴上，负数都在0的______边，正数都在0的______边．

High school students are some of the busiest people in the world. To get the most from all you do, you must be in control of your time. Otherwise decision that affect how well you play the game, what position you play and when you get to play will be decided for you. Your success in high school depends on your use of time. Here are some important things to remember.

·Begin each term by filling in a master plan. First fill in things you must do (classes, work, practice, etc. that you can’t change.) Then find the most effective use for these times.

·Set a regular time and place for study. This will save your time in the long run. If you have a study hall in your school, use it!

·Use daylight hours to study whenever possible. For most people for every hour of study done in daylight hours, it will take them one and a half hours to do the same task at night.

·Take breaks. Don’t plan marathon study time. Have a short rest before you study again.

·By using flash cards or summary sheets, you can use odd times to study while you’re waiting for class to start or for a friend to pick you up.

·If possible, plan study time with a partner. Choose your partner wisely however. Make sure you study, not socialize.

·Do the most difficult tasks for times when you are active. (For example, when you’re energetic, it will become easier to solve maths questions; when you’re tired, it will be impossible!)

·Make a daily checklist. Do the most important tasks first.

小题1:According to the passage, your success in high school mainly lies in _________.

A．making full use of your time

B．your hard work

C．your brainpower

D．how well you play the game小题2:We should use daylight hours to study whenever possible because __________.

A．school study halls are open to students only in the daytime

B．most people can spare more time to study in the daytime

C．it’s more difficult to study effectively at night

D．we have more important things to do than study at night小题3: On how to use our time, we should follow the following suggestions EXCEPT _______.

A．working out a complete plan for the whole term

B．keeping a good balance between study and rest

C．putting the most important tasks first

D．trying to study alone instead of working with others

要使空气按设计要求通过布风板，形成稳定的流化床层，要求布风板具有一定的（）。

A.形状

B.尺寸

C.规格

D.阻力