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【单选题】
S1:MV Blue Whale, this is Avonport Port Control. Nets with buoys in this area. Please navigate with caution. Over.S2:Avonport Port Control, this is Blue Whale. I will navigate with caution. Over.S1:MV Blue Whale, this is Avonport Port Control. Keep clear of the fairway. Search and rescue in progress. Over.S2:Avonport Port Control, this is Blue Whale. I will keep clear. Over.S1:MV Blue Whale, this is Avonport Port Control. You course is deviating from the radar reference line. Over.S2:Avonport Port Control, this is Blue Whale. What course do you advise? Over.S1:MV Blue Whale, this is Avonport Port Control. Advise make course 120 degrees. Over.S2:Avonport Port Control,.this is Blue Whale. Making course 120 degrees. Over.S1:MV Blue Whale. This is Avonport Port Control. There is a large tanker to the north of you leaving the fairway. You must wait for her to cross ahead of you. Over.S2:Avonport Port Control, this is Blue Whale. I will wait for the large tanker to clear. Over. Q3:Why is MV Blue Whale advised to change course?A.
Because she is running into shallow water.
B.
Because she is converging to the radar reference line.
C.
Because she is diverging from the reference line.
D.
Because she is not using correct radar range scale.
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【判断题】程序控制系统: 输入信号是一个已知的函数,系统的控制过程按预定的程序进行,要求被控量能迅速准确地复现输入,这样的自动控制系统称为程序控制系统。( )
A.
正确
B.
错误
【单选题】对NAKAKITA型黏度控制系统正确的认识是（）。 ①加热器是温度程序控制系统的控制对象 ②加热器是黏度定值控制系统的控制对象 ③测黏计是黏度定值控制系统的测量单元 ④差压变送器是温度程序控制系统的变送单元 ⑤蒸汽调节阀是温度程序控制系统的执行单元 ⑥蒸汽调节阀是黏度定值控制系统的执行单元
A.
①②③④⑤
B.
①②③⑤⑥
C.
①②④⑤⑥
D.
②③④⑤⑥
【简答题】表面张力系数表示液面需要增加( )时,外力需要做的功。
【单选题】对NAKAKITA型黏度控制系统正确的认识是________。1加热器是温度程序控制系统的控制对象;2加热器是黏度定值控制系统的控制对象;3测黏计是黏度定值控制系统的测量单元;4差压变送器是温度程序控制系统的变送单元;5蒸汽调节阀是温度程序控制系统的执行单元;6蒸汽调节阀是黏度定值控制系统的执行单元。
A.
①②③④⑤
B.
①②③⑤⑥
C.
①②④⑤⑥
D.
②③④⑤⑥
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