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單項選擇題

Be careful（）mix the inflammable cargo with that kind.

A.do not
B.will not
C.shall not
D.not to

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單項選擇題

Before entering a tank, always check the vapor content（）a combustible gas indicator.

A.with
B.by
C.of
D.for

單項選擇題

Direct delivery and discharge can（）the handling operation.

A.speed down
B.quick
C.slow down
D.facilitate

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