概括地看，柏拉图提出“理念说”，最重要的目的是？（）
A. 为苏格拉底申辩
B. 为真理寻找判断标准
C. 为知识寻找根据
D. 为知识的合法性提供逻辑判断
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客户购买的总成本是指客户为了获得一组利益而不得不付出的（）（）（）（）。
用于水泥混凝土路面板块修补的材料，应达到哪些技术要求？
If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place,（）.
A. the relief of that officer shall be made prior to such action has been completed
B. the relief of that officer shall never be made
C. the relief of that officer shall be deferred until such action has been completed
D. the relief of that officer shall be made by the captai
（）不到位禁止施工。
A. 施工负责人
B. 监控人员
C. 配合人员
D. 驻站联络员
E. 安全防护员
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