薄板群钻,外缘处磨出锋利的两个刀尖,与钻心刀尖相差仅(),形成三尖。
A.0.1~0.5mm
B.0.5~1.5mm
C.1.5~2.5mm
D.2.5-3.5mm
参考答案:B
.When and where to go for the on-salary holiday ___ yet.
A.are not decided
B.have not been decided
C.is not being decided
D.has not been decided
“勿以恶小而为之,勿以善小而不为。”此句出自( )。
A.《三国志》
B.《资治通鉴》
C.《文章》
D.《诸弟三首》