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某企业某年度计划销售收入为1000万元，年度计划销售资金率为25%，自有流动资金计划数额为150万元，可参加周转的其他流动资金为30万元，试计算周转贷款数额。

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Why Is it So Difficult to Swat a Fly？
The brains of flies are wired to avoid the swatter, US researchers said on Thursday.
At the mere hint of a threat, the insects adjust their preflight stance to flee in the opposite direction, ensuring a clean getaway, they said in a finding that helps explain why flies can so easily evade swipes from their human foes.
"These movements are made very rapidly, within about 200 milliseconds, but within that time the animal determines where the threat is coming and activates a set of movements to position its legs and wings," Michael Dickinson of the California Institute of Technology said in a statement.
"This illustrates how rapidly the fly's brain can process sensory information into an appropriate motor response," said Dickinson, whose research appears in the journal Current Biology.
Dickinson's team studies this process in fruit flies using high-speed digital imaging equipment and a fancy fly swatter.
In response to a threat from the front, the fly moves its middle legs forward, leans back and raises its back legs for a backward takeoff. If the threat is from the side, the fly leans the other way before takeoff.
The findings offer new insight into the nervous system of the fly, and lends a few clues on how to outsmart them.
Dickinson, a bioengineer, has devoted his life's work to the study of insect flight. He has built a tiny robotic fly called Robofly and a 3-D visual flight simulator called Fly-O-Vision.