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【单选题】
工作在交流额定电压1200V,直流额定电压()以下的元件,称为低压电器元件。A.
1500V
B.
1000
C.
800
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反馈参考答案：
举一反三
【单选题】Yaw is a rotation about the _______ axis.
A.
longitudinal
B.
lateral
C.
vertical
D.
horizontal
【单选题】The three axes of rotation for an aircraft is____-____, ____-____, and _____-____?
A.
longitudinal-roll， lateral-pitch， vertical-yaw
B.
longitudinal-pitch， lateral-roll， vertical-yaw
C.
longitudinal-roll， lateral-yaw， vertical-pitch
D.
longitudinal-pitch， lateral-yaw， vertical-roll
【简答题】Yaw
【单选题】The machine can’t be made perfect overnight； in fact it should be improved ______.
A.
one by one
B.
step by step
C.
place by place
D.
one after another
【单选题】Yaw is a rotation about the vertical axis giving a side-to-side movement of the nose known as sideslip
A.
俯仰
B.
横滚
C.
偏航
D.
抬头
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