The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by (). passing it through the expansion valve。 condensing refrigerant in the system condenser。 passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor。 maintaining a high pressure on the systems receiver。
简述气泡病的症状和病理变化。
列入目录的产品,必须经国务院认证认可监督管理部门()的认证机构进行认证。 授权。 委托。 指定。 认可。
蕨类植物的生活史为()。 孢子体占优势,配子体、孢子体均独立生活。 孢子体占优势,配子体寄生于孢子体上。 配子体占优势,孢子体寄生于配子体上。 只有孢子体,无配子体。
In order to prevent a person()general average contribution on the ground that he was at fault,the fault must be something which constitutes an actionable wrong. to recover。 to be recovered。 being recovered。 recovering。
以下关于ATM原理描述正确的是()。