The project we discussed yesterday _____ provide an outlet for children's creativity.
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Don't ____ your problems to dominate your life.
A. set goals
B. allow
2-18以下机床的运动属于主运动的是()。
A. 车床刀具移动
B. 钻孔时钻头的移动
C. 刨削时牛头刨床刨刀的往复运动
5-15 为了提高精度、降低成本,减少加工工序和零件装夹次数,最理想是一次装夹完成全部加工。()
A. 对
B. 错