国标规定，矩形花槽的定心方式以（）。
A.大径定心
B.小径定心
C.键侧定心
D.键宽定心
参考答案：B
__________, the pay isn't attractive enough, though the job itself is quite interesting.[ ]
A. Generally speaking
B. On the contrary
C. In particular
D. To be honest
下列清代学者为《说文解字》作注疏的有（）
A.段玉裁
B.王筠
C.朱骏声
D.桂馥
