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【简答题】
在蜗杆传动中,蜗杆头数越少,则传动效率越 ,自锁性越 ,一般蜗杆头数取 。
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【单选题】设年名义利率r=10%,以季度为周期计息,则年有效利率ieff为( )。
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10.25%.
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10.38%.
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used to; is used to walk
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was used to: is used to walk
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used to; is used to walking
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the total number of atomic sites
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A.
10%
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A.
5%
B.
10%
C.
15%
D.
20%
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