Gas mask的意思是()。
A.空气呼吸器
B. 压力气瓶
C. 防毒面具
D. 压缩空气
- · 有3位网友选择 B,占比37.5%
- · 有3位网友选择 C,占比37.5%
- · 有1位网友选择 D,占比12.5%
- · 有1位网友选择 A,占比12.5%
A.空气呼吸器
B. 压力气瓶
C. 防毒面具
D. 压缩空气
______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
On all vessels equipped with refrigeration units of over 20 cubic foot capacity, _____.
A.a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided
B.it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus
C.spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus
D.all of the above
A.The tank should be tested only once to ensure the oxygen content is at least 14% before entry
B.The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated
C.The tank need not be tested for oxygen content if it is ventilated for more than 24 hours
D.If the oxygen content tests at less than 12% you should wear an approved gas mask
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