Burning fuel with a high sulfur content in a diesel engine will （） ["increase thermal efficiency","cause clogging of the fuel system","increase the ability of the engine to start in cold weather","produce corrosion in the cylinder and exhaust system at low load"]
青霉素G钠水溶液容易失效，因此临床应现用现配。
感冒时，兽医常选用抗生素药物，因为抗生素对病毒有效。
下列属于盗窃燃气的是（）。 ["燃气表后私接管道","燃气表后安装另一燃气表","流量计拆线或掉电人为制造死表","软管超长"]
A stream of water immediately surrounding a moving vessel’s hull，flowing in the same direction as the vessel is known as（）. ["directional current","forward current","propeller current","wake current"]
简述轴箱装置的作用及分类。
