未分类题

传染病都有病原体,可以是微生物或寄生虫。常见的病原体有：()

A.细菌
B.病菌
C.原虫蠕虫
D.真菌

【参考答案】

A,B,C,D
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Prof. Frank Flynns study has found thatA．employees are wary of generosity in the workplace.B．there are more takers than givers among the engineers.C．takers are the most productive among the employees.D．generosity seems to be an obstacle to productivity.
单项选择题
根据地下水对建筑材料腐蚀评价标准，其腐蚀等级可分为()个等级。
A.三
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