Optional computer control system is available for auto control of feed, water and steam addition.
可选配计算机控制系统，实现对物料、水和蒸汽的全自动控制。
He said use of the operating system would be optional for all agencies.
他指出所有机构，使用那一操作系统都将成为一种选择。
The fifth part: the teaching strategies of optional class system in senior high schools.
第五部分：普通高中走班制教学策略初探。
The fifth part: the teaching strategies of optional class system in senior high schools.
第五部分：普通高中走班制教学策略初探。
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