农民专业合作社成员总数超过20人的，企业、事业单位和社会团体成员不得超过成员总数的（） ["20%","5%","10%","80%"]
什么是春化素？
A ground can be defined as an electrical connection between the wiring of a motor and its（）. ["shunt field","circuit breaker","metal framework","inter-pole"]
口岸查验包括（）、核查货证两种方式。 ["验证","换证","出证","抽查"]
下面哪个是明显性需求（）。 ["确认问题","分析现状","抱怨与不满","问题点"]
何谓退关箱？
