如下图所示，某机械循环热水采暖系统采用高位膨胀水箱定压，膨胀水箱高水位与循环水泵的高

如图为条形磁铁与通电螺线管之间的磁感线分布情况，请标出磁感线方向，并画出螺线管的绕法．

某同学在竖直悬挂的弹簧下加挂钩码，探究弹力与弹簧伸长量的关系．下表是该同学的实验数据．实验时弹簧始终未超过弹性限度.  g取10N/kg

(1)根据实验数据在坐标系中作出弹力F跟弹簧伸长量x关系的图象．

(2)根据图象得到弹簧的劲度系数是______N/m.

试说明设计放映机房设备布局、管线及线槽铺设方案。

Part of the debate about culture revolves around issues of perspective and ownership. Within a nation such (1) the United States—a nation whose cultural heritage includes elements from every corner of the world (2) are a great many perspectives coexisting and intertwining in the cultural fabriC．When we all ask (3) as individuals, "what belongs to me, to my culture " we are rewarded with a spectacular variety of (4) ; in this way, different perspectives and ownership of different cultural traditions enriches everyone. But when we ask " (5) belongs to us, to our culture " we ask a much harder question. Do the people of the (6) States, or of any culturally complex human society, necessarily share common cultural elements If so, who gets (7) decide what those elements are
This debate is a crucial one in many cultures throughout the world (8) . In the US, the debate promises to impact the way we educate our children—that is, (9) manner and shape in which culture reproduces itself—and the way we write our laws. In (10) countries, equally crucial issues are at stake.
For many people, what is at stake is the character (11) US national identity. Hirsch argues that this identity needs to become less culturally fragmented; others, like Walker, (12) that the national character gets its strength from cultural diversity, from the freedom (at home and in (13) ) to celebrate, honor, and reproduce different cultural traditions. Those who take this latter view follow the reasoning (14) Shweder, arguing that we need to accept that there are multiple valid cultural perspectives and that two (15) perspectives can both be valid even though they might contradict one another.
Recognize that the position you (16) in this debate about culture—whatever position you take—is a political one with implications (17) what we should value, what we should praise, what we should accept, what we should teach. When (18) reflect on this debate, when you contribute your own voice to the discussion, try to be (19) of the implications that follow from your position. When you listen to the voices of others, try to (20) with awareness, deciding for yourself what is at stake and how their positions relate to your own.

精制装置有几条管线与低压瓦斯系统相连？（）

A.1

B.2

C.3

C.4