首页/ 题库 / [问答题]鱼全身为什么总是滑溜溜的?的答案

鱼全身为什么总是滑溜溜的?

问答题
2022-03-23 01:56
查看答案

正确答案
因为鱼类表皮层中有单细胞的黏液腺,当渔体受到刺激后,可释放大量的黏液物质,所以鱼体总是滑溜溜的。黏液时鱼体有保护作用,不易被敌害捕捉,同时可减低鱼类游泳时的阻力,并且有助于鱼体的渗透压调节。

试题解析

标签: 大学试题 理学
感兴趣题目
(), or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.
A salvor may be()the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.
The () is used for hauling in or letting out the wires or ropes.
Vessels must be()valid certificate of nationality or certificated of registry or license.
When loading or discharging dry mud or cement,crew members should use goggles and().
Effects which are dutiable or subject to prohibitions or restrictions should be declared in ().
The()may examine or re-examine the goods or take samples from them straightaway in the absence of the consignee or the consignor whenever it considers this necessary.
()are liable to be stoten, pilfered or may damaged due to improper handing or stowage.
Banks have no liability for any delay or loss caused by postal or telex failure.
逻辑运算符(AND、NOT、OR)的运算顺序是AND→OR→NOT。
在实验试题中,你研究了雌性对雄性的选择是否有特别的喜爱。这里的问题是为什么虹 鱼表现这些偏爱。 为简化问题,假定多数雌鱼喜爱大尾鳍雄鱼。根据这一情况,一雌鱼个体与一大尾鳍雄鱼交尾比随机地同任何雄鱼交尾有什么好处()
逻辑运算符(AND、NOT、OR)的运算顺序是AND→OR→NOT。
相关题目
boost的意思是:help or encourage to increase or improve
eloquent的意思是:fluent or persuasive in speaking or writing

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

库仑土压力理论的基本假定是什么?【长安大学2005、2006、2007年硕士研究生入学考试试题(A卷)】
什么是滑溜牵伸?适用范围如何?
什么叫ORS?如何配制?如何使用?
Mainly east 3 or 4 partly cloudy to overcast occasional rain()slowly south moderate or good.
()any case or suspected case of quarantinable disease,or any case of eruptive disease or any death be discovered,the local quarantine officer must be notified immediately.
Should any case or suspected case of quarantinable disease,or any case of eruptive disease or any death be discovered,the local Quarantine Officer must be()immediately.
Masters are()solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.
If he is a common carrier,he is absolutely responsible to the owner of the goods carried ()any loss or damage to them unless caused by an Act of God or the Queen’s enemies,or the inherent vice in the goods themselves,or the negligence of the owner of the goods,or a general average sacrifice.
系统中雷达状态包括Unknown、Operational(or ON)、Failed(or OFF)、Detached。
Owners are to be responsible for loss of or damage to the goods or delay in delivery of the goods only in case the loss,damage or delay has been caused by the improper or negligent stowage of the goods.This means that().
The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire,()the claimant proves that the fire arose from fault or neglect on the part of the carrier,his servants or agents.
Shutdown price(or point,or rule) 停业价格(或停业点、停业原则)
翻译:With Average or With Particular Average(WA or WPA)()
鱼全身为什么总是滑溜溜的?
语文教学评价中单项性试题和综合性试题的功能有什么不同?为什么要以综合性试题为主?
()shall be liable for loss of and damage to the Vessel and/or goods arising or resulting from inaccuracies in stating the description,quantity,weight,measurement or contents.
Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo,without the authorization or privity of the Shipowner or his agent,is().
广告位招租WX:84302438

免费的网站请分享给朋友吧