GB／T1184—1996中，圆度、圆柱度公差等级规定了_____级，精度最高的是_____。
A. 20，IT01
B. 12,1
C. 13,0
D. 18,1
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最大实体要求主要用于保证______的场合。
A. 配合性质
B. 最小壁厚
C. 功能要求
D. 可装配性
平行度公差应小于其相应的距离公差值。
A. 对
B. 错
What is the passage mainly about?
A. setting sales prices
B. influencing competitors
C. lowering fixed exppenses
D. preventing rising expenses
Business are only allowed to lower prices if
A. they are dumping
B. they remain above their costs
C. they are being sued
D. their competitors agree
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