下列哪一项不是蝗虫外骨骼的功能?( ) A.对身体有支持作用 B.保护内部器官

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问题:

下列哪一项不是蝗虫外骨骼的功能?(  )

A.对身体有支持作用

B.保护内部器官

C.协助呼吸

D.防止体内水分蒸发

考点:动物的形态结构和功能
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如果要将某表中的若干记录删除,应该创建______查询。

题型:选择题

Are you a _____小题1:___(健康的) child? Bob, a 14-year-old boy, is very unhealthy. He likes to ____小题2:____(乘坐) his father’s car to school. Sometimes he goes to school by __小题3:_(地铁).  He does exercise only __小题4:__( 一次) a week. He likes eating ___小题5:__(垃圾) food very much. This week his parents are in Paris on ___小题6:_____(度假). So he eats lots of unhealthy food every day. Now Bob is badly__小题7:___(生病的) in hospital. The doctor says, “ You should ___小题8:___(经常)do exercise, and have a good _小题9:(饮食) habits. It’s ___小题10:____(重要的) for your health. 

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双重神经支配

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急性乙型肝炎最早出现的血清学际志是

A.HBsAg

B.抗-HBs

C.HBeAg

D.抗-HBe

E.抗-HBc

题型:选择题

雄性动物配种前性刺激一般是指()、()。

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