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单选题
外部标牌和标记用于地面勤务说明、检查、警戒、警告等。
A
Exterior Placards and Markings are required for ground servicing instructions, inspections, cautions, warnings.
B
Exterior Labels and Markings are required for ground servicing instructions, inspections, cautions, warnings.
C
Exterior Placards and Markings are required for ground servicing instructions, inspections, warnings, cautions.
答案解析
正确答案：A
相关知识点：
外部标牌用于多种地面说明
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