我国流行对人致病的虫媒病毒主要有_______、_______和_______等。
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汉坦病毒核衣壳外有包膜和刺突,其中刺突又含有__________成分,能凝集鹅红细胞。
HFRS典型的临床过程包括:_________、__________、__________和__________。
登革病毒引起的疾病包括
A. 登革热
B. 登革出血热
C. 登革休克综合征
D. 登革肺炎
E. 登革脑炎
1.Since the beginning of 2013, these regulations _____ in most workplaces across the country. (2016-12)
A. will be introduced
B. have been introduced
C. are introduced
D. were introduced