设则f(50)(0)=______．

发布时间：2017-01-28 01:04 │ 来源：www.tikuol.com

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问题：

设

则f⁽⁵⁰⁾(0)=______．

考点：普通考研考研数学(二)考研数学二

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世界上按面积大小居前四位的国家是

A 俄罗斯、加拿大、中国、美国

B 俄罗斯、加拿大、中国、巴西

C 俄罗斯、中国、巴西、澳大利亚

D 加拿大、俄罗斯、中国、美国

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社区营养改善措施可以是______。

A．进行营养教育和咨询服务

B．改善卫生条件

C．推行食品强化

D．补充营养素，防治营养缺乏病

E．调整膳食结构，预防慢性疾病

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任务型阅读
     Florida, in the southeastern United States, is called the Sunshine State.It grows more oranges than any
place except Brazil.But Arctic air has damaged some Florida oranges and strawberries in recent days, and
killed fish at tropical fish farms.
     The unusually long period of cold weather has shown how even warm climates can sometimes freeze
over.But protecting plants and trees in the garden may not be too difficult if you follow a few suggestions.
Sudden cold can be the biggest threat, expecially after a warm period.Plants have not had a chance to
harden their defenses.Those that are actively growing or flowering are at high risk.
     Try to choose plants that live best with cold weather, and make planting areas face west and south.
Being near other growth may also provide warmth.
     Most frost damage takes place at night.Ice crystals form on the leaf surface.They pull moisture(水分)
from the leaves and keep plant tissues from getting water.
      Cold weather is most likely to damage or kill plants that do not have enough moisture.So keep the
garden watered.Moist soil absorbs more heat than loose, dry soil covered with mulch or vegetation.
      Experts of University of Arizona say covering plants and small trees with cloth or paper can help
prevent frost damage.A onehundred watt light bulb designed for outdoor use can also provide warmth.
Some people place Christmas lights on young trees for warmth.The bulbs should hang below the leaves
to let the heat rise into the tree.
      Cold is especially dangerous to citrus trees.Agricultural specialists at the University of California
suggest putting paper or cloth around the trunk and central branches of young Citrus trees.
In Florida, as temperatures fell to record lows, citrus growers sprayed water on their trees to help prevent
freeze damage.
     Jim Bottcher is a master gardener with the University of Florida extension.He explains that as the water
freezes, it produces heat, and the ice forms a protective blanket around the tree.If you spray a tree, keep
the water away from nearby power lines.Heavy ice can form and break them.
     You can also wrap a tree in palm tree frond leaves, corn stalks or fiberglass.Adding plastic film works
well in rain and snow.But experts say plastic alone does not help much.

1 caused by cold in Florida	__2__damage to some oranges and strawberries. Killing fish.
3 to protect plants and trees	Choose plants__4__for cold weather. Try to make the garden remain __5__. __6__plants and small trees with cloth or paper. Hang bulbs __7__warmth below the leaves. __8__the trunk and the branches of young citrus trees with paper or cloth. __9__the ice as a protective blanket. Some tree__10__and plastic film can protect the tree.

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(2012年)E公司为-家上市公司，为了适应外部环境变化，拟对当前的财务政策进行评估和调整，董事会召开了专门会议，要求财务部对财务状况和经营成果进行分析。相关资料如下：　　资料-：公司有关的财务资料如下表所示：　　财务状况有关资料单位：万元

经营成果有关资料单位：万元

说明：“*”表示省略的数据。　　资料二：该公司所在行业相关指标平均值：资产负债率为40%，利息保障倍数(已获利息倍数)为3倍。　　资料三：2011年2月21日，公司根据2010年度股东大会决议，除分配现金股利外，还实施了股票股利分配方案，以2010年年末总股数为基础，每10股送3股。工商注册登记变更后公司总股数为7800万股，公司2011年7月1日发行新股4000万股。　　资料四：为增加公司流动性，董事陈某建议发行公司债券筹资10000万元;董事王某建议，改变之前的现金股利政策，公司以后不再发放现金股利。　　要求：

结合E公司目前偿债能力状况，分析董事陈某提出的建议是否合理并说明理由;

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用煤气作为燃料，其主要缺点是易爆炸和（）

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