下列表面预处理的方法中，属于化学处理方法的是（）。
A．喷砂除锈
B．酸洗除锈
C．磷化处理
D．纯化处理
参考答案：B, C, D
皮损多种，形态各异，总有瘙痒、糜烂、流滋、结痂证候的皮肤病称为______。
When ______ about the secret of his success, Steven Spielberg said that he owes much of his success and happiness ________ his wife and children.
A．asking; to
B．asked; in
C．asked; to
D．asked; about
