与乙国相比，甲国维持其在世界鲜切花市场竞争力的优势条件是

A.专业化、规模化生产，鲜切花价格较低

B.土地丰富，天然花卉品种较多

C.培植历史久，劳动力成本较低

D.技术含量高，鲜切花质量较优

相关问题推荐

• 我省鲜切花的三大生产基地是（）。

  A．西双版纳

  B．大理

  C．呈贡

  D．中甸

  查看答案
• 共用题干
  Keeping Cut Flowers（鲜切花）
  1. While everybody enjoys fresh cut flowers around his/her house,few people know how to keep them for as long as possible .This may be done by keeping in mind a few simple facts.
  2. An important thing to remember about cut flowers is that they are sensitive to temperature.For example,studies have shown that cut carnations（康乃馨）retain their freshness eight times lon-ger when kept at 12℃than when kept at 26℃．Keeping freshly harvested flowers at the right tem-peratures is probably the most important aspect of flower care.
  3. Flowers are not intended by nature to live very long.Their biological purpose is simply to at-tract birds or insects,such as bees,for pollination（授粉）.After that,they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide（二氧化碳）, called respiration（呼吸）,generates the energy the flower needs to give the flower its shape and color. The making of seeds also depends on this energy.While all living things respire,flowers have a high level of respiration.A result of all this respiration is heat,and for flowers the level of heat relative to the mass of the flower is very high.Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration,the sooner the flower dies.
  4. How,then,to control the rate at which flowers die?By controlling respiration.How is respi-ration controlled?By controlling temperature .We know that respiration produces heat,but the re-verse（相反的过程）is also true. Thus by maintaining low temperatures , respiration is reduced and the cut flower will age more slowly.
  5. Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to“drink”water that is dirty or otherwise polluted.Even when water looks and smells clean,it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach（漂白剂）can be used in small quantities.It is recommended that 15 drops of chlorine bleach(at 4%solution)be add-ed to each litre of water. The water and solution should also be replaced each day.
  Paragraph 2________
  A: Control of Respiration
  B: Beauty of Fresh Cut Flowers
  C: Role of Respiration
  D: Most Important Aspect of Flower Care
  E: Need for Cleanwater
  F:.Ways of Stopping Respiration

  查看答案

• 鲜切花采收后应该采取预冷措施，比较适宜的预冷方式有______、水预

  冷、_____、强制通风冷却、冰预冷和冷库预冷等。

  查看答案

• 下列哪项不是我国鲜切花事业存在的问题？（）

  A、技术水平低，靠天吃饭

  B、鲜切花出口混乱

  C、缺乏拳头产品

  D、种质资源贫乏

  查看答案

• 作为一般生态规律，越是耐寒的鲜切花越不耐热，越是耐热的鲜切花越不耐寒。

  A、对

  B、错

  查看答案