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You are carrying cargoes of crotonaldehyde，phosphoric acid，and morpholine on your multiple-product tanker. Which of the following statements is TRUE? （）
A:Each of the cargoes must be segregated from the other by at least two barriers
B:The minimum protective clothing required for taking samples of phosphoric acid is goggles or a face shield
C:Aluminum，copper，and zinc are prohibited in all valve parts in contact with these cargoes
D:The required warning sign must have the legend "cancer hazard" added to it

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出自：海船船员证

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