We can conclude from paragraph 2 that
A. Government spending and taxation have nothing to do with people"s livelihood.
B. Political and economic policies has a negative impact on some American"s livelihood.
C. tax and spending policies plays a very important role in reducing debts.
D. increasing private investment spending and export can boost economy.
查看答案
铰孔不但能保证尺寸、形状精度和减小孔的表面粗糙度,还能纠正位置精度。()
一般在装配精度要求较高,而环数又较多的情况下,应用极值法来计算装配尺寸链。()