选择腐蚀
参考答案：
是指多元合金中较活泼组分或负电性金属的优先溶解。
It's very hot today. You can _____ your coat, Jack. [ ]
A. put on
B. take off
C. wear
You have done so much work—you ______ pass the exam.
A．are likely to
B．have to
C．can
D．are bound to
