If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be (). excessive condenser cooling water。 warm food in the refrigerator。 a shortage of refrigerant。 s shortage of compressor oil。
电解法降解COD时,是利用阳极上生成的()来氧化污水中的有机物。 OH+自由基。 O2。 OH-。 H+。
If the ship is delayed by reason of Charterer’s failure to name a port,()will be liable for the damages. the owner。 the Charterer。 the shipper。 the carrier。
简述日本新鱼蚤病的流行情况。
Thermostatic expansion valve are (). either all the way open or all the way closed。 normally open。 throttled depending on load。 controlled by suction pressure。
衰减器主要采用金属蒸发膜来吸收光能进行光衰减,衰减大小与膜厚度()。