主页
学科
搜索
账户
常见问题
当前学科：闸门运行工
题目：
单选题
闸室主要由（）的底板及上部结构如闸墩、闸门、启闭机、工作桥和交通桥等几个部分组成。
A
下部结构
B
基础部分
C
水闸中间段
D
闸室段
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
在办理个体工商户贷款时，如借款人同意参加人身意外伤害保险时，应指定（）为抵押财产保险的第一受益人。
应急关断系统控制单元的核心部分是（）。
近代中国人民反侵略战争失败的根本原因是武器装备的落后。
一般普碳镇静钢常用的脱氧材料是（）。
音频控制面板上复位按钮的作用是什么（）？
在日常营运中，驾驶员要时刻注意自己的言行举止，尽可能对乘客多一声问候、多一个微笑、多一点宽容、多一些提醒。此题为判断题(对，错)。
蛋鸡从出壳到淘汰，共分三个阶段进行饲养，即（）、（）、产蛋期。
价值型投入产出表记录了全部用货币计量的中间产品价值、（）价值、（）价值和总产值。
甲公司中标成为某市一幢32层酒店大楼工程的施工总承包人。有关事件如下：(1)生效的总承包合同约定，可将水电暖通安装工程分包，分包施工单位为乙公司。(2)乙公司在与甲公司签订分包合同后，又把其中的水电安装工程分包给了一家具备相应资质的专业安装公司丙。(3)甲公司在签订总包合同后，又与一家总承包二级资质房屋建筑工程公司丁签订了工程主体结构的施工承包合同。上述合同中，合法有效的是（）。
回答题Human needs seem endless．They might be regarded as making up several levels．When there is enough money to satisfy one level of needs, another level appears．The first and most basic level of needs involves food．Once this level is satisfied, the second level of needs, clothing and some sort of shelter, appears．By the end of World War Ⅱ , these needs were satisfied for a great majority of Americans．Then a third level appeared．It included such items as automobiles and new houses．By 1957 or 1958 this third level of needs was fairly well satisfied．Then, in the late 1950s, a fourth level of needs appeared: the "life-enriching level．While the other levels involve physical satisfaction, that is, the feeding, comfort, safety, and transportation, this level stresses mental needs for recognition, achievement, and happiness．It includes a variety of goods and services．Among them are vacation trips, the best medical and dental care, and recreation．Also included here are fancy goods and the latest styles in clothing．On the fourth level, a lot of money is spent on services, while on the first three levels more isspent on goods．A fifth level would probably involve needs that can be achieved best by community action．Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime, and prejudice．After filling our stomachs, our clothes closets, our garages, our teeth, and our minds, we now may seek to ensure the health, safety, and leisure to enjoy more fully the good things on the first four levels．According to the passage, man will begin to think about such needs as housing and clothing only when________