简述标准麻花钻主切削刃和横刃的前角特点。
参考答案:
标准麻花钻主切削刃前角的特点是前角是变化的,其规律为由外到内由正前角变为负前角;横刃前角的特点是负前角。
—Good morning, Madam.
—Hello, I’d like to buy a book or a magazine on fashion.
—_________
A.Just a minute, please.
B.What can I do for you?
C.What’s the matter?
D.At your service.
茵陈蒿汤煮药的煎煮顺序是()
A.先煮大黄,后纳二味
B.先煮栀子,后纳二味
C.三者同时煎煮
D.先煮二味,后纳大黄
E.先煮茵陈,后纳二味