问题
单项选择题
关于误差复映的描述，（）是不正确的。
A、加工前的误差以类似的形状反映到加工后的工件上去。
B、若一批工件的毛坯尺寸不一，加工后的工件仍有尺寸不一的误差。
C、误差复映系数ε（ε<1）定量地反映了毛坯误差经加工后所减少的程度。
D、工艺系统的刚度越大，误差复映的现象就越明显。
答案
参考答案：D
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关于误差复映的描述，（）是不正确的。
A、加工前的误差以类似的形状反映到加工后的工件上去。
B、若一批工件的毛坯尺寸不一，加工后的工件仍有尺寸不一的误差。
C、误差复映系数ε（ε<1）定量地反映了毛坯误差经加工后所减少的程度。
D、工艺系统的刚度越大，误差复映的现象就越明显。
参考答案：D
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| At the beginning of this century, medical scientists made an interesting discovery: we are built not just of flesh and blood but also of time. They were __1__ to show that we all have 6'a body clock" 2__ us. which controls the 3_ and fall of our body energies, 4_ us different from one day to the next. The 5 _ 0f "a body clock" should not be too 6 _ since the lives of most living things are controlled 7 the 24-hour night-and-day cycle. We feel 8 and fall asleep at night and become 9__ and energetic during the day.lf the 24-hour-cycle is _10 , most people experience unpleasant 11 .For example, people who are not 12 to working at night can find that 13__ of sleep causes them to 14 _ badly at work. 15 the daily cycle of sleeping and 16 , we also have other cycles which 17 longer than one day. Most of us would 18 that we feel good on some days and not so good on 19 ; sometimes our ideas seem to flow and at other times, they _20__ do not exist. | |||
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