螺纹中径的母线通过牙形上的沟槽和凸起的宽度应（）。
参考答案：相等
想一想，选一选。
( )1. It's warm today!
( )2. It's hot today.
( )3. It's cool today.
( )4. It's cold today.
A. Put on your T-shirt.
B. Put on your coat.
C. Take off your jacket !
D. Put on your sweater.
商品流通企业可以不设置的账户是______。
A．管理费用
B．制造费用
C．财务费用
D．营业费书
