铣削一标准之齿条,其齿数z=40,应选用()齿轮铣刀
A.3
B.6
C.4
D.8
参考答案:D
—I’m sorry I don’t speak English very well.
—No, your English is good enough.
—__________.
A.No, I don’t think s
B.Thank you
C.I’m very sorry to hear that
D.But yours is much better than mine
下列各句加点词的用法归类正确的一项是( )
①方其破荆州,下江陵,顺流而东也 ②不霁何虹
③舞幽壑之潜蛟 ④朝歌夜弦
⑤侣鱼虾而友麋鹿 ⑥箕踞而遨
⑦能守其土,义不赂秦 ⑧吾从而师之
A.①④⑦∕②⑥∕③∕⑤⑧
B.①②⑦⑧∕③∕④⑥∕⑤
C.①②∕③∕④⑥∕⑤⑦⑧
D.①②⑦∕③∕④⑥∕⑤⑧