要加工一批零件，原计划每天加工a个，30天完成．实际每天加工b个，实际多少天完成？
a×30÷b=30a÷b（天）；
答：实际30a÷b天完成．
This is just between you and me. You _________ tell anyone about this. [ ]
A. mustn't
B. can
C. should
D. have not to
“用寒远寒，用热远热”，属于
A．因病制宜
B．因地制宜
C．因人制宜
D．因时制宜
E．因证制宜
