The sewing machine is A.double-rockermechanism B.double crank mechanismC.crank-rocker mechanism D.rocker-crank mechanism
A.
. double-rocker mechanism
B.
. d ouble crank mechanism
C.
. crank-rocker mechanism
D.
. rocker-crank mechanism
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【简答题】When employees ‘___________ ’, i.e. inform their employer that they will be leaving the company as soon as their contract allows, the company should try to discover why the person has resigned.