首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Keeping Cut Flowers 1 While everybody enjoys fresh cut flowers around their house, few people know how to keep them for as long
Keeping Cut Flowers 1 While everybody enjoys fresh cut flowers around their house, few people know how to keep them for as long
admin
2009-06-15
31
问题
Keeping Cut Flowers
1 While everybody enjoys fresh cut flowers around their 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 longer when kept at 12°C than when kept at 26°C.Keeping freshly harvested flowers at the right temperatures 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 attract 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 (工氧化碳), called respiration (呼吸), generates the energy the flower needs to give the flower its shape and colour. 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 respiration controlled? By controlling temperature. We know that respiration produces heat, but the reverse 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 (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach (at 4% solution) be added to each litre of water. The water and solution should also be replaced each day.
选项
答案
D
解析
转载请注明原文地址:https://jikaoti.com/ti/rKmsFFFM
本试题收录于:
职称英语综合类B级题库职称英语分类
0
职称英语综合类B级
职称英语
相关试题推荐
TheCaseoftheDisappearingFingerprintsOneusefulanti-cancerdrugcaneffectivelyerasethewhorls(萝状指纹)andothercharact
We’veseenamarkedshiftinourapproachtothesocialissues.
CellPhones:HangUporKeepTalking?Millionsofpeopleareusingcellphonestoday.Inmanyplacesitisactuallyconsider
TheFoodScandalWidensAsthescopeofthefoodscandalwidensinTaiwan—morethan200firmsand500productshavebeeninv
TheFoodScandalWidensAsthescopeofthefoodscandalwidensinTaiwan—morethan200firmsand500productshavebeeninv
EnergyandPublicLandsTheUnitedStatesboastssubstantialenergyresources.FederallandsprovideagooddealofUSenerg
LearningDisabilitiesLearningdisabilitiesareverycommon.Theyaffectperhaps10percentofallchildren.Fourtimesasm
A.whenitisabsorbedbymatterB.whenitiscloudyC.becausetheycanpassthroughsolidobjectsD.whenthesunraysarefie
Thereisadifferencebetweenscienceandtechnology.Scienceisamethodofanswering(51)questions,technologyisamethodofs
Theresultsofthenewstudyareunexpected.Amongthescientiststhatdidthestudy,therearemoreChinesethanAmericans.
随机试题
我国《建设工程质量管理条例》(中华人民共和国国务院令第279号)规定,()对建设工程的施工质量负责。
女性,25岁。近期腰痛白带多,宫颈重度糜烂,宫颈馀片为炎症。应首选下列哪项处理
乙股份有限公司(以下简称“乙公司”)为华东地区的一家上市公司,属于增值税一般纳税人。乙公司2018年至2021年与固定资产有关的业务资料如下:(1)2018年12月1日,乙公司购入一条需要安装的生产线,取得的增值税专用发票上注明的生产线售价为1170万元
关于校对方式的优缺点,说法正确的有()等。
下列思想流派与产生时代对应错误的是()。
中华文明之所以绵延数千年而不绝,中国社会之所以会有超___________结构的历史,就是因为它一直有一套___________的,为多数民众所接受的主流价值观念,即所谓的儒家价值观。填入画横线部分最恰当的一项是:
下列是一个JavaApplet程序,填空使它的功能为计算数组各元素和的平均值。importjavaapplet.*;importjavaawt.*;publicclassTestvvextendsApplet
窗体上有一个名称为Text1的文本框;一个名称为Timer1的计时器控件,其Interval属性值为5000,Enabled属性值是True。Timer1的事件过程如下:PrirateSubTimer1_Jimer()Smilef
给你的好友张龙发送一封主题为“购书清单”的邮件,邮件内容为:“附件中为购书清单,请查收。”,同时把附件:“购书清单.docx”一起发送给对方,张龙的邮箱地址为zhanglong@126.com。
Mydog,Hero,isn’tafraidofmostthings.Butheisafraidofthevacuumcleaner(真空吸尘器).HealwayshidehimselfwhenMumcleanst
最新回复
(
0
)