单选题
819.Once designed and approved, the establishment of thorough maintenance procedures is a must.
819.Once designed and approved, the establishment of thorough maintenance procedures is a must.
一旦设计和批准,建立彻底的维护程序是必须的。
A
It is urgent to establish the thorough maintenance procedure after designed and approved.
B
Once designed and approved, scheduled maintenance procedures must be built.
C
Once designed and approved, complete maintenance procedures must be set
答案解析
正确答案:C
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