学会生存的作文400左右_学会生存作文400字

  本文关键词：学会生存作文400字，由笔耕文化传播整理发布。

学会生存作文400字

生存作文是在丛林的话可以抓  注意 千万不要用手抓用些的东西 要坚硬用手之前要确定它死了 在生火烤千万不要身上有伤口有的话最好不要吃 怎样识别有毒蛇和无毒蛇呢，一般人单凭头部是否呈三角形或者尾巴是否粗短，或者颜色是否鲜艳来区分，这是不够全面的。虽然毒蛇头部呈明显的三角形，但也有的毒蛇，，头部并不呈三角形；而无毒蛇中的伪蝮蛇，头部倒是呈三角形的。五步蛇、腹蛇和眼镜蛇的尾巴确实很粗大，但烙铁头的尾巴就较细长；很多色泽鲜艳的蛇，如玉斑锦蛇、火赤链蛇等并非是毒蛇，而蝮蛇的色泽如泥土或似狗屎样，很不引人著目，但却很毒。因此区别有毒和无毒蛇主要根据以下几点：
Survival composition is in the jungle it can catch do not pay attention to grab some stuff to hard hand prior to determine it died in the fire roasted never had a wound so it is best not to eat how to identify the serpent and non-poisonous snakes, generally a head is triangular or tail is coarse short, or whether the bright colors to distinguish, it is not comprehensive enough. Although the snake head were triangular, but also some snakes, the head is triangular; without the viper in the pseudo viper, the head is triangular. Agkistrodon acutus, vipers and cobra 's tail is very thick, but iron head tail is slender; many bright color snake, Elaphe Mandarina, such as fire Dinodon rufozonatum not venomous snakes, and viper color such as soil or the like shit, very obscure the eyes, but poisonous. So the difference between toxic and harmless mainly according to the following points:
1、毒腺 有毒蛇具有毒腺，无毒蛇不具有毒腺。毒腺是由唾液腺演化而来。位于头部两侧、眼的后方，包藏于颌肌肉中，能分泌出毒液。当毒蛇咬物时，包绕着毒腺的肌肉收缩，毒液即经毒液管和毒牙的管或沟，注入被咬对象的身体内使之发生中毒，无毒蛇无这一功能。
1, poisonous snake venom gland with venom, snake venom toxicity does not have. Venom is produced by the salivary glands evolved. Located on both sides of the head, eyes in the jaw muscles in the rear, parcel, can secrete venom. When the snake bite, surrounds the venom gland muscle contraction, venom by venom duct and fangs pipe or ditch, was injected into the bite object within the body to produce toxic, non-poisonous snakes without this function.
2、毒液管 是输送毒液的管道，连接在毒腺与毒牙之间。只有毒蛇才具备有毒液管。
In 2, venom duct is connected in the pipeline conveying venom venomous fangs, and between. Only the Viper to have venom duct.
3、毒牙 毒蛇具有毒牙，它位于上颌骨无毒牙的前方或后方，比无毒牙既长又大。
In 3, the Viper has fangs fangs, it is located in the maxilla without fangs in the front or rear, than the long and large fangs.

  本文关键词：学会生存作文400字，由笔耕文化传播整理发布。