在园艺上应用生长素处理植物难以奏效的是[ ]
A.获得无子果实
B.促进果实成熟
C.处理扦插的枝条促进生根
D.杀死单子叶田间的双子叶杂草
答案:B
切削用量是在切削加工过程中切削速度(V)、()的总称。
The registrar had decided not to enter the black people’s names in the voting book.