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______of the following is (are) required on your cargo vessel when it has a refrigerated cargo space? ① A gas mask using a suitable canister to protect against the refrigerant. ② A self-contained breathing apparatus.

A.① only

B.Either ① or ②

C.② only

D.Neither ① nor ②


参考答案

更多 “ ______of the following is (are) required on your cargo vessel when it has a refrigerated cargo space? ① A gas mask using a suitable canister to protect against the refrigerant. ② A self-contained breathing apparatus.A.① onlyB.Either ① or ②C.② onlyD.Neither ① nor ② ” 相关考题
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