试题与答案

安装槽道应符合以下规定().A.端正牢固,并与大列保持垂直 B.列间槽道应成一直线,

题型:多项选择题

题目:

安装槽道应符合以下规定().

A.端正牢固,并与大列保持垂直

B.列间槽道应成一直线,左右偏差不超过5mm.

C.两列槽道拼接处水平度偏差不超过2mm.

D.槽道距地面距离不小于2400mm.

答案:

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题型:单项选择题

The cost C of manufacturing a certain product can be estimated by the formula C=0, 03rst2, where r and 8 are the amounts, in pounds, of the two major ingredients and t is the production time in hours. If r is increased by 50 percent, s is increased by 20 percent,and t is decreased by 30 percent, by approximately what percent will the estimated cost of manufacturing the product change ?()

A.40%increase

B.12%increase

C.4%increase

D.12%decrease

E.24%decrease

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