钩虫的幼虫和成虫致什么病?
参考答案:
幼虫致病:1)钩蚴性皮炎2)钩蚴性肺炎
成虫致病:1)消化道症状,肠壁的出血2)异嗜症3)贫血4)婴儿钩虫病
Spyware and other forms of malware are the biggest online threat to your computer’s()nowadays. These malicious()which get to your PC through freeware, shareware, commercial sites, deceptive pop-ups or in any other way, can record your surfing habits and sites you visit, share your personal information with their partners. Any personal(), when in wrong hands, can leave you a victim of an "identity theft" by stealing your credit()details, birth records and other()information.
Any personal()
A.information
B.estate
C.life
D.existence
推理是学习化学知识的一种常用方法.下列推理正确的是( )
A.原子和分子都是微观粒子,化学变化中原子不能再分,所以分子也不能再分
B.因为氢气和氧气混合后点燃可能发生爆炸,所以使用氢气前都要验纯
C.因为一氧化碳和二氧化碳的组成元素相同,所以两者的化学性质相同
D.化合物是由不同种元素组成的纯净物,所以只含一种元素的物质一定不是化合物