【简答题】在短期中,当产量为0时,()A. 总成本等于0,可变成本等于0; B. 总成本大于0,可变成本等于0; C. 固定成本大于0,可变成本等于0; D. 固定成本大于0,可变成本大于0。
【单选题】FM系统通过增加( )来换取( )性能:
【单选题】结核性胸膜炎加用糖皮质激素,用法是:( )
【单选题】Mr. Smith is not doing well; the doctor told us that several colds _____ his health.
【单选题】Mr. White is not doing well; the doctor told us that several colds _____ his health.
【单选题】下列使用糖皮质激素的说法正确的是
A.
一般用在结核中毒症状较重的胸膜炎,而结核性脑膜炎和心包炎应在抗结核的基础上常规加用糖皮质激素