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单选题
639.如何判断烟雾面罩可用( ) What should be checked on the protective breathing equipment available?
A
外包装上有绿色指示 The indicator shows the operational colour-green.
B
外包装上有红色指示 The indicator shows the operational colour-red.
C
外包装铅封在位 The tamper seal is not broken
答案解析
正确答案：C
解析：
题目解析
答案:C
解析：要判断烟雾面罩是否可用，需要检查外包装的铅封是否仍然在位，没有被破坏。因为如果铅封被打破，可能表示烟雾面罩已经被使用或者损坏，不再可用。所以，选项C是正确的。外包装上的颜色指示通常是指示烟雾面罩的过期日期或服务状态，而不是是否可用。因此，选项A和B都不是正确的答案。
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