A clear polystyrene plastic standard selected for exposure as check on a test apparatus and operating conditions.
挑选一件符合聚苯乙烯塑料件标准的塑料件，用于在检测仪器和操作条件下的曝光测试。
Standard for sleeper arrangement should conform to operating conditions, and should match with different parts of track.
轨枕配置标准应与运营条件相适应，并与轨道各部件合理匹配。
Internationally, the assessment of the quality of a hotel operating conditions takes the level of occupancy rate of hotel room as the standard.
在国际上，评定一个酒店经营状况的好坏一般以酒店客房出租率的高低为标准。
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