安全库存是指企业在正常的经营环境中为满足日常的需要而建立的库存。
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A vessel engaged in()shall not impede the passage of any other vessel navigating within anarrow channel or fairway.
A. mine clearance operation
B. towing operation
C. dredging or surveying or underwater operation
D. fishing
馅心是指将各种制馅原料,经过精细加工处理、调剂、拌和而包入米面等坯皮内的"心子"。
A. 正确
B. 错误