下列不属于制样设备的选项是()。
A、天平
B、筛子
C、对辊式破碎机
D、二分器
参考答案:A
I really appreciate____ to help me with my maths, but I’m afraid that I have no time this week.
A.you to offer
B.it you offer
C.your offering
D.this you are offering
转速图中的一点三线是什么?