当对总体数量精度要求不太高的情况下,可用()的数字资料推断总体的数量,不过推断的结果是一个很粗略的近似值。
A、抽样调查
B、重点调查
C、普查
D、典型调查
参考答案:D
With more than 200 million views worldwide.the latest video Gangnam Style very popular since it____________.
A.has become;was uploaded
B.became;uploaded
C.became,was uploaded
D.has become.is uploaded
苏芸金杆菌为生产上应用最多的昆虫病原:()
A.细菌
B.放线菌
C.真菌
D.病毒