设置____标志位可使显示的正数前面带有一个加号。
参考答案:ios::showpos
To my surprise, my good friend _________ stay up to study to prepare for the next important exams
organized by ten famous high schools. [ ]
A. should
B. may
C. must
D. can
影响油墨细度的主要原因有()。
A.颜料填料和助剂在连结料中的分散程度
B.连结料本身的细度
C.颜料本身粒度
D.研磨操作