在不提高系统刚度的情况下，（）进给次数可以有效减少复映误差。切削速度提高，冷硬层深度和硬度程度也随之减小。
参考答案：增加
It was not until near the end of the letter ______ she mentioned her own plan.
A．where
B．that
C．why
D．when
制备含剂量为0.05g毒性药物的散剂，一般需制成哪种倍散
A．1:10
B．1:50
C．1:100
D．1:500
E．1:1 000
