储集层油气在流入井底的过程中，压力损失集中在井底中心部位。

调度机构分为五级：即国家调度机构、跨省、自治区、直辖市调度机构、省、自治区、直辖市级调度机构、（）、县级调度机构。

用所给词的适当形式填空(15分)

小题1:Let’s have a party to welcome the new members of the          (Student) Union.

小题2:How          (active) you are! You’d better take part in more after-school activities.

小题3:Tommy promised         (not be) late for class next time.

小题4:I felt much        (calm) after listening to the relaxing music.

小题5:Why not share your happiness and         (sad) with your close friends?

小题6:The old man had difficulty        (get) to the top of the mountain.

小题7:Very few people were found         (wake) when the earthquake happened last night.

小题8:Granny was too tired to reach           (four) floor of the building.

小题9:We never doubt that the new novel is worth        (read) for several times.

小题10:If the problem          (deal) with peacefully, the world will be more and more beautiful.

小题11:—Sandy          (suffer) from stress for a few weeks.    —Sorry to hear that.

小题12:It’s important for us to spend our time         (wise).

小题13:Among the four boys, Paul is            (suitable) for the job.

小题14:I often tell my students not to keep worries to       (they).

小题15:        (practice) hard, and you will be sure to win the competition.

“到1700年英国的制度框架为经济增长提供了一个适宜的环境，现在舞台已为产业革命布置就绪”。道格拉斯诺思《西方世界的兴起》中的结论反映的历史唯物主义观点是 [ ]

A．经济基础决定上层建筑

B．上层建筑反作用于经济基础

C．生产力决定生产关系

D．生产关系反作用于生产力

熔断器的用途是（）、（）。

联系实际说明建材行业如何建立岗位评价指标示体系。