软化系数代表材料的哪种性能()
A.耐水性
B.吸湿性
C.抗冻性
D.抗渗性
参考答案:A
解析:材料的耐水性用软化系数表示
According to what he complained about, something must have gone wrong with the computer, ______?
A.mustn’t it
B.didn’t he
C.hasn’t he
D.didn’t it
非少尿型急性肾衰竭