压缩式空调系统的四个主要部件中属于热交换设备的有()。 ["膨胀阀","压缩机","冷凝器","蒸发器"]
学校网球场的收费是多少?() ["1元\/人\/次","2元\/人\/次","4元\/人\/次","5元\/人\/次"]
气体扩散法是将含有磷的气体在高温()度下向硅片进行扩散。 ["200--400","800--900","1000—1500","2000—5000"]
学校上网的流量费是多少?() ["0.015元\/MB","0.020元\/MB","0.15元\/MB","0.20元\/MB"]
等外水准测量其前后视距累差不超过()米。 ["20","30","40","50"]
试述气性坏疽的临床表现及诊断要点。