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单选题
A technician is trying to retrieve a screw that fell inside a case and is just out of reach. Which of the following is the BEST procedure to retrieve the screw?（）
A
Turn the case upside down, shake gently and let the screw fall out.
B
Use a shop vacuum to retrieve the screw.
C
Use the hardware abstraction layer (HAL).
D
Use an extension magnet.
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Use a shop vacuum to retrieve the screw.C
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