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【单选题】
计算船舶受风压力时所用的风力系数Ca的值与角的关系是()。A.
当角为0°或180°时,该值为零
B.
当角为90°时该值最大
C.
风力系数Ca的值随角的变化呈马鞍形曲线,当角为30°、150°左右时,该值均出现极大值
D.
风力系数Ca的值与角无关
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举一反三
【单选题】In our school, the students have three_____ courses, and seven______ entrepreneurial education courses .
A.
required; alternative
B.
requiring; alternative
C.
required; alternate
D.
requiring; alternate
【单选题】Put on dark glasses or the sun will ______ you and you won't be able to see.
A.
discern
B.
distort
C.
distract
D.
dazzle
【单选题】____ you won't be able to succeed.
A.
It is alike that
B.
It is like that
C.
The chances are that
D.
The chance is that
【单选题】In our school, the students have three _________courses and seven _________ courses. [ ]
A.
required ; alternative
B.
require ; alternative
C.
requiring ; alternative
D.
require ; alternate
【单选题】You won't be able to finish the job _______ you stop playing around.
A.
unless
B.
lest
C.
in case of
D.
so that
【单选题】For our middle school students, some courses are compulsory, while others are ______. [ ]
A.
flexible
B.
optional
C.
impressive
D.
significant
【单选题】飞行操纵系统中主操纵系统在飞行中的功用是
A.
用来操纵副翼、方向舵和升降舵的运动
B.
操纵飞机绕纵轴、立轴和横轴转动，以改变或保持飞机的飞行姿态
C.
操纵飞机沿纵轴、立轴和横轴运动，以改变或保持飞机的飞行姿态
D.
操纵飞机起飞、着陆和上升、下降
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