单选题
发布日期:2021-03-22
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续航时间又称之为“航时”。它是指飞机在不进行空中加油的情况下,耗尽其本身携带的可用燃料时,所能持续飞行的时间。
机动船(powerboat),相对于人力船,是指机器产生动力的船舶。亦称“自航船”。依靠本船主机的动力来航行的船。可分为蒸汽机船、柴油机船、汽轮机船、燃气轮机船、电力推进船、喷水推进船、核动力船等。采用汽油机或船用挂机的小艇,常称为“摩托艇”。
单船,又叫单船指导员,就是按照码头泊位划分的各个泊位上的所有生产作业的生产管理员。他们负责指导船舶装卸,解决或汇报船舶装卸中遇到的问题,督促检查船舶装卸作业人员的装卸进度和装卸质量,现场协调解决装卸技术问题。
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关于DNA碱基组成的规律正确的是()。
Cloze 16 Mark was walking home from school one day when he noticed a boy ahead of him had dropped all of the books he was carrying. Mark helped the boy pick them up. 1 they were going the same way, he carried them for the boy. As they walked, Mark knew the boy’s name was Bill. Mark 2 . discovered that he loved computer games, baseball and history and that he was having a lot of 3 with his other subjects. They arrived at Bill’s home first and Mark was invited in 4 Coke and to watch some television. The afternoon passed 5 with a few laughs and some shared small talk, and then Mark went home. They 6 to see each other around school, had lunch together once or twice and then 7 ended up from the same high school. Just three weeks before they finished school, Bill asked Mark if they could have a talk. Bill 8 him of the day years ago when they had first met. ‘Do you 9 wonder why I was carrying so many things home that day?’ asked Bill. ‘You see, I 10 out my locker because I didn’t want to leave a mess for anyone else. I had planned to 11 from home and I was going home to pack my things. But after we spent some time together 12 and laughing, I realized that 13 I had done that, I would have 14 a new friend and missed all the fun we would have together. So you see, Mark, when you picked up my books that day, you did a lot more. You 15 my life.’
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燃烧产物对灭火工作不利的方面有哪些?
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船长L<50m的机动船(单船),在航时应显的号灯有:()。 ①首灯; ②尾灯; ③舷灯; ④桅灯
船长L<50m的机动船(单船),在航时应显的号灯有:()。 ①首灯; ②尾灯; ③舷灯; ④桅灯
L<12m的机动船应显示()
当船舶的长度30m≤L<50m时,桅灯的最低一盏不小于最高甲板以上()。
显示()的机动船表示机动船的长度小于50m。
除另有规定外,12m<船长<50m的在航机动船应显示的号灯为()。
均重货物使用60t平车装载,两端均衡突出时,其突出车端长度L<1500mm其装载重量不得超过()。
均重货物使用60t平车装载,两端均衡突出时,其突出车端长度L<1500mm其装载重量不得超过()。
L<50m的在航机动船,侧视时可看见的信号灯为()。
L<50m的在航机动船,尾视时可看见的信号灯为()。