煅淬要反复几次，至辅料吸尽、药物全部酥脆为止。
参考答案：对
— I’m afraid what I did cannot satisfy your requirements.
— _____. At least you tried.
A．I don’t believe it.
B．Don’t say so.
C．Never mind.
D．It was not your fault.
写出一个无理数a，使3＜a＜4，则a为______．
