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【单选题】
已知双头圆柱蜗杆传动的传动比为30,则蜗轮的齿数为A.
1/15
B.
15
C.
30
D.
60
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【单选题】What is the land area of the UK?
A.
about 244,000 km2
B.
about 2,440,000 km2
C.
about 24,400,000 km2
【单选题】Land is purchased for $62,500. Back taxes paid by the purchaser were $7,500; total costs to demolish an existing building were $11,000; fencing costs were $12,500; and lighting costs were $1,500. Wh...
A.
$62,500
B.
$81,000
C.
$93,500
D.
$95,000
【简答题】简述在R、L、C三者串联交流电路中,电路何时呈电阻性、电感性、电容性?
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