题干

由中国承建的帕德玛大桥是孟加拉跨越恒河的公路铁路两用桥。该桥在世界同类桥梁中基础施工难度最大。桥梁基础部分将采用斜桩施工,每个钢桩重量达500吨,钢管壁厚60毫米,共240根。为了把这幺重的钢桩倾斜打八120米深的地下,专门制造了世界上最大的造价接近l亿的液压锤。帕德玛大桥主桥上部结构为跨度150米的钢桁梁——预应力混凝土桥面板组合结构连续渠.主桥上部结构设置为跨度150米的钢桁梁,主要考虑的是(    )

A:防范洪涝

B:河海联运

C:节省投资

D:防御飓风

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答案(点此获取答案解析)

B

同类题1

      Held on the second Wednesday of March each year, No Smoking Day helps people across the UK who want to stop smoking. The activity encourages and helps smokers to give up, and publicizes(宣传) the many sources of help offered to people. Each year over a million smokers take part in the day, while about 40,000 actually give up smoking.
      The much-publicized effects of smoking include increased risk (风险) of heart disease, lung cancer and asthma. However, smoking also causes dull skin and wrinkles. The reducedamount of oxygen getting to the skin accelerates (加速)aging, and makes the skin look sallow (病黄色的). And while many smokers believe that cigarettes help them to cope with stress (对付压力), scientific research has shown that worry levels actually go down after giving up smoking.
    Set a date and time to stop, and keep to it .Talk to your doctor about whether any kind of medicines might suit you. Find out if there is a stop-smoking health center near you .Try to get the help of your friends and family. Keep away from situation in which you used to reach for cigarette. If you need to, use nicotine patches (尼古丁戒烟贴片) or gum.
    NHS Stop-smoking Centers are all over the UK, providing free services. They have specially trained employees who can advise you on the best way to stop smoking. There are also a number of free national helpline in England, Scotland, Wales, and Northern Ireland, where expert counselors can discuss with you how to give up smoking step by step.

同类题2

阅读材料,完成下列要求.

材料一  明清江南地区依托多种经营有机结合的集约化农业和自然资派的优势,拥有充足的原料市场,如蚕丝、草棉两大类,又有由于人口数量增长产生的农业过剩劳动力构建的巨大而低廉的劳动力市场,因而使得手工业得到长足发展,丝织业与棉纷织业两大手工行业极为突出,向为学者所关注。……明清江南本地农村过剩人口、外来人口大全汇聚于城镇的工商业,促使多种服务需求大增,形成一支可观的服务大军,包括轿夫、脚夫、饮食、旅馆、盘夫、土工、吹手、剃头、整容、饭馆、面馆、酒馆、膳食馆铺、娱乐服务业等,都吸引本地或外地人口参与,也产生了不少社会问题,政府必须及时加以管理。

材料二  明期中后期至19世纪中叶以前,苏州是中国唯一拥有全国经济中心地位的城市。苏州“首重机业.城东比户皆然”,丝绸、棉布行销全国各省,“其外洋如高丽、印度以及欧美各国,莫不有销路”。鸦片战争之后,“洋布盛行,布补销减”,“蚕梅得丰岁,而皆不偿本”。据统计,道光年间苏州尚有12000余部织机,到1880年织机仅有5800部。苏州的手工业行会众多,许多行会在19世纪七八十年代还对产品划定统一的价格,并实施统一工价,以限制竞争和自由雇佣。棉布、棉纱、茶丝和米的贸易都不再经流苏州,转而经由上海。20世纪二三十年代,苏州变成了大上海的“卫星城”。

——以上摘编自王卫平《明清时期江南城市史研究:以苏州为中心》