表盘直径不得小于()毫米,精确度不低于2.5级。
A.50
B.100
C.120
D.150
参考答案:B
前序法是先访问 【4】 ,然后按前序周游左子树,按前序周游右子树。
Johnson would have faced the music but he ______ doing things like that.
A.had stopped
B.stopped
C.was stopping
D.has stopped