销毁涉密文件、资料要履行（）手续，并由两名以上工作人员到指定场所监销。
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The all-purpose nozzle will produce a fog spray when you（）.
A. pull the nozzle handle all the way back toward the operator
B. pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzle
C. push the nozzle handle forward as far as it will go
D. insert a fog applicator between the fire hose and nozzle
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