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【单选题】
在单级放大电路中,若输入电压为正弦波形,用示波器观察uo和ui的波形,当为共集电时,则uo和ui的相位( )。
A.
同相
B.
反相
C.
相差90°
D.
相差120°
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【多选题】认知心理学在学习方法上倡导 和 。
A.
发现学习
B.
接受学习
C.
自主学习
D.
创造学习
【单选题】创伤现场救护的目的是缝合伤口.骨折复位。()
A.
B.
【单选题】80%敌敌畏乳油10ml稀释成0.05c/o的浓度,计算加水量是( )kg。
A.
16
B.
160
C.
1.6
D.
1600
【单选题】—  Do you mind if I open the window? — ______ . I feel a bit cold. [     ]
A.
Of course not
B.
I'd rather you didn't
C.
Go ahead
D.
Please close it
【单选题】80%敌敌畏乳油10ml稀释成0.05c/o的浓度,计算加水量是( )kg。
A.
16
B.
160
C.
1.6
D.
1600
【单选题】There are many navigational aids().
A.
in chief engineer's room
B.
in chief officer's room
C.
on the bridge
D.
on deck
【单选题】苯甲酸与三氯化铁试液作用生成的产物为
A.
紫色
B.
绿色
C.
赭色
D.
黄色
【单选题】Many navigational warnings are of a temporary nature,but others remain in force for several months or may be succeeded by ______.
A.
Notices to Mariners
B.
Sailing Directions
C.
List of Lights and Signals
D.
Guide to Port Entries
【单选题】--- Do you mind if I turn on the air-conditioner? ---___________. I feel a bit hot.
A.
You’d better not
B.
Go ahead
C.
I’d rather you didn’t
D.
Of course
【单选题】Our ship________with many modem navigational instruments.
A.
equipped
B.
is equipped
C.
equips
D.
has equipped
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