能够将病原体从人或者其他动物传播给人的生物,如蚊、蝇、蚤类等是()
A.病原携带者
B.自然疫源地
C.病媒生物
D.菌种、毒种
E.人畜共患传染源
参考答案:C
—Could you tell me_______?
—Sorry, I don't know. I was not at the meeting. [ ]
A. what does he say at the meeting
B. what did he say at the meeting
C. what he says at the meeting
D. what he said at the meeting
PMU装置与其他系统进行信息交换的帧的校验由()完成。
A、循环冗余码
B、海明码
C、奇偶校验码