关于流行性出血热病毒分离,下列哪项是错误的()
A.乳鼠颅内注射
B.豚鼠颅内注射
C.接种A549肺癌细胞株
D.接种VeroE6细胞株
E.接种人胚二倍体细胞
参考答案:B
A(n) ______ is a destructive program that fills a computer system with self-replicating information,clogging the system so that its operations are slowed or stopped.
A.worm
B.macro
C.CIH
D.Trojan
()的整地深度宜应稍深些。
A.生根性树种与速生丰产林
B.浅根性树种与速生丰产林
C.浅根性树种与慢生树种
D.速生树种与慢生树种