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10°/10°Z 形操纵试验
nautic., tech. 10°/10° zig-zag test
Z 形操纵试验
nautic., tech. zig-zag maneuver test
20°/20°Z 形操纵试验
nautic., tech. 20°/20° zig-zag test
形操纵试验: 4 phrases in 1 subject
Nautical4