磨钛合金应选择超硬磨料磨具( )。
A．CBN
B．MBD
C．DMD
参考答案：A
询价采购的缺点（）。
A.缺乏竞争性
B.缺乏灵活性
C.缺乏公开性
D.采购价格往往较高
The old man is so ______ that he has to ______ his meals every day. [ ]
A. forgettable; be reminded of
B. forgetful; be remembered of
C. forgetful; be reminded of
D. forgettable; be remembered of
