Which is NOT a distress signal? ()
A continuous sounding with any fog signal apparatus
B. A signal sent by radiotelephone consisting of the spoken word "Mayday"
C. An International Code Signal of
D. The firing of green star rockets or shell
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()是个人全面发展的现实途径
A. 集体
B. 自身
C. 父母
D. 老师
柴油机排气冒黑烟的原因之一是()。
A. 喷油量过大或雾化不良
B. 喷油时刻过早
C. 气门间隙调整不当或气门密封不严
D. 喷油量过小或各缸喷油量不匀
驾驶员的视觉特性从()、()、()等几个方面体现。