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[单选] In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly ().

A . saturated
B . super-cooled
C . wet
D . superheated

Which of the following is the stated proper sequence before commencing cargo operations aboard Ro-Ro vessels?() Start ventilation,lower the ramp,notify engine room。 Lower the ramp,start ventilation,notify engine room。 Notify engine room,lower the ramp,start ventilation。 Start ventilation,notify engine room,lower the ram。 企业最优资本结构是指在一定条件下使企业负债资本成本最低的资本结构。() 为发展与经销商之间的关系,厂商应努力为经销商提供()。 满意的产品。 全面的服务。 信息的通道。 严格的监管。 经营的场所。 积碳是一种() 不燃物。 易燃物。 难燃物。 Which of the following is suitable for bagged cargo?(). hydraulically operated pusher。 spread beam sling。 revolving roll clamping device。 platform sling。 In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly ().
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