计算题:一种管材的拉伸成品率为70%,要生产3500kg这种管材需要投坯料多少?
参考答案:
投料重量=成品重量÷拉伸成品率=3500÷70%=5000kg
I think you look great as you are. You shouldn’t be _________ about your weight.
A.excited
B.confused
C.frightened
D.embarrassed
沿齿轮任意圆周上,轮齿两侧渐开线间的弧长称为()。
A.齿距
B.齿厚
C.齿宽
D.全齿高