未注销上国国籍的民用航空器不得在中华人民共和国申请（）
A、国籍登记证书
B、适航证书
C、经营许可证
参考答案：A
Many useful tools and techniques are used in developing schedule（）is a schedule network analysis technique that modifies the project schedule to account for limited resource.
A.PERT
B.Resource levelling
C.Schedule compression
D.Critical chain method
寄生虫病的防治原则是什么？
