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简述驳岸工程主要的破坏因素。

答案

参考答案：

（1）、湖底地基荷载强度与岸顶荷载不相适应而造成均匀或不均匀沉陷使驳岸出现纵向裂缝甚至局部塌陷。

（2）、常水位至湖底部分处于常年被淹没状态，其主要破坏因素是湖水浸渗。

（3）、常水位至最高水位这部分驳岸则经受周期性淹没，随水位上下的变化也形成冲刷；最高水位以上不被淹没的部分主要是浪击、日晒和风化剥蚀。

单项选择题

口服色甘酸钠(pKa=2.0)后在胃肠道的吸收情况：

A．胃肠道中都呈非离子化形式，都难吸收
B．肠道中都已离子化，都难吸收
C．肠中基本都已离子化，易吸收
D．胃肠道中都已离子化，易吸收
E．胃中基本都已离子化，易吸收
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填空题

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.
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