专用设备价款的支付和结算，一般不包括______。
A．预付款 B．阶段付款C．进度款 D．最终付款
参考答案：C
23. Your room is terribly dirty; you get it cleaned in two hours, or Mum will be angry.
A．can
B．might
C．shall
D．may
创伤性气胸
