烘炉是除去筑炉材料中存在的水份，并使耐火材料内部结构完成某种组织转变。
参考答案：对
I really appreciate ____ to help me with my maths, but I’m afraid that I have no time this week．
A．you to offer
B．it you offer
C．your offering
D．this you are offering
目前对肾盂鹿角状结石的最佳治疗方法是（）.
A.ESWL
B.经皮肾镜碎石术
C.ESWL+经皮肾镜碎石术
D.经肾盂切开取石术
E.患肾切除术
