在下列吸附中,属于物理吸附的是()。
A.用氢氧化钾分析CO、CO2混合气
B.用活性碳给糖脱色的反应
C.用氯化钙提纯丙醛中的乙醇
D.人身上附着的烟味(本人不吸烟)
参考答案:D
Mum asked Lucy ________.[ ]
A. if could she get some tea for her
B. whether she get some tea for her
C. if she could get some tea for her
D. whether she can get some tea for her
对一些非金属材料,易脆裂和成片状的压合材料常采用加热冲裁。