继代周期
参考答案:从接种培养开始到下一次接种继代所经历的时间(周或天)
—What are you doing on your next day _______?
—I want to have a good rest at home because I’m very tired these days. [ ]
A. off
B. on
C. of
D. up
竣工验收由建设单位组织,()配合。
A、设计单位
B、监理单位
C、施工单位
D、建设主管部门