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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
A.Exterior Placards and Markings are required for ground servicing instructions, inspections, cautions, warnings.
B
B.Exterior Labels and Markings are required for ground servicing instructions, inspections, cautions, warnings.
C
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：
外部标牌用于勤务等选A
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