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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】滚珠丝杠螺母副消除间隙的方法常采用双螺母结构,利用两个螺母的相对轴向位移,使两个滚珠螺母中的滚珠分别贴紧在螺旋滚道的两个相反的侧面上,预紧力要小于最大轴向载荷( )。
A.
1/2
B.
1/3
C.
1/4
【单选题】what is the third profit source?
A.
technology
B.
raw materials
C.
logistics
D.
labor
【单选题】What is a firm's gross profit?
A.
the difference between the sales and other income generated by the firm, and all costs, taxes, and expenses incurred by a firm in a given period
B.
the difference between sales revenues and the costs
C.
the difference between sales revenues and cash expenditures associated with those sales
D.
all of the above