不定项选择 使君子与使君子仁用量相同

单项选择题 Characteristics of services include intangibility, heterogeneity, simultaneity, perishability and no transfer of ownership

判断题 压缩机是汽车空调制冷装置的心脏，其作用是将低压低温的气态制冷剂压缩成高压高温的气态制冷剂，并推动制冷剂在系统中循环流动。