第30题:[单选题]. By” permissive period in education” (Para.2) the author means a time ( ). A. when children are allowed to do what they wish to B. when everything can be taught at school C. when every child can be educated D. when children are permitted to receive education 参考答案:A
第31题: [单项选择]饭店用电管理的基础是()。 A. 建立电力计量系统 B. 更新设备设施 C. 建立能源使用数据库 参考答案:A