利用各种加热器对空气加热，使其温度升高，这一过程为（）
参考答案：等湿升温过程
The shoes ________ that he ________ at last.
A．cost so expensive; gave them away
B．took too much; gave them up
C．took such little; gave them out
D．cost so much; gave them up
劳动合同被确认部分无效的，这个合同可以不予执行。（）
