靠近刚刚烧开水的水壶仔细观察,会看到从壶盖小孔中冒出一缕“气”.为什么这缕“气”

题型:问答题

问题:

靠近刚刚烧开水的水壶仔细观察,会看到从壶盖小孔中冒出一缕“气”.为什么这缕“气”要升到相距小孔一定距离的地方才能看到?

考点:液化现象、方法及其应用
题型:问答题
借鉴别人的学习秘诀, 是学习的捷径之一。请把下面的学习秘诀和例子对上号。
Secrets of top students
Example One: “If I don’t understand what my teacher is explaining in the science,                        
I ask him to say it again,” says Anna Lee. “also asking more helped a lot.”   
小题1:____________
Example Two: “When a teacher asks us to do a lot of homework,”says Dave Roman “ I             
will draw up a timetable and plan to do it little by little, so it isn’t so tiring.
小题2:__________
Example Three: One student put a vocabulary list on the wall of the bathroom. He
learned a new word every day while brushing his teeth. Another student used the time
to remember biology terms while practicing running.                     
小题3:____________
Example Four: In high school, Mike played football, painted and was in the band.
“I was so busy that I couldn’t waste time looking for a pencil or missing paper. I kept everything in order.” He says.                                                小题4:__________
Example Five: Christi is an excellent student at the university. If her math teacher
asks her to do five problems, she does ten. If the history teacher asks her to read
five pages, she reads ten. “Part of learning is practicing,” she says, “and the
more you practice, the more you learn.”                              
小题5:___________
A. Get your things in order.
B. Plan your time well.
C. Study anywhere or everywhere.
D. Speak out and ask more.
E. Do more than you are asked.
F.Make yourself busy
题型:问答题

客房用品种类繁多,因而在选择时必须坚持()的原则。

A.保证质量经久耐用

B.美观、实用、适度和价格合理

C.与房内装饰的色调相一致

D.体现本店风格

题型:问答题

抗干扰能力较差,抗雷击的性能也差,电缆的三相阻抗不平衡和零序阻抗大,难以使线路保护电器可靠地动作的电缆是()。

A.交联聚乙烯绝缘聚氯乙烯护套细钢带铠装电力电缆

B.交联聚乙烯绝缘聚氯乙烯护套电力电缆

C.铜芯导体电力电缆

D.聚氯乙烯绝缘聚氯乙烯护套电力电缆

题型:问答题

如果工作场所潮湿,为避免触电,使用手持电动工具的人应()。

A、站在铁板上操作

B、站在绝缘胶板上操作

C、穿防静电鞋操作

题型:问答题

F检验法可用于比较不同条件下所测定的2组数据是否具有相同的精密度。

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