《中华人民共和国教师法》规定，教师考核的机构主体是（）。
A.当地教育行政部门
B.当地政府
C.教师所工作和服务的学校
D.当地教育督导组织
参考答案：C
脊髓灰质炎的传播途径（）
A.血液传播
B.虫媒传播
C.粪-口途径
D.空气飞沫传播
E.经土壤传播
A company has a cash conversion cycle of 80 days. If the company' s average receivables turn-over increases from 11 to 12, the company' s cash conversion cycle:（）
A. decreases by approximately 3 days.
B. increases by approximately 3 days.
C. decreases by approximately 30 days.
