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【单选题】
HAL_TIM_PWM_Start(&htim4,TIM_CHANNEL_2);A.
开启定时器PWM输出
B.
开启定时中断
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反馈参考答案：
举一反三
【单选题】The Egyphan boat continued to approach the American ship probably because
A.
the Egyptians thought it was OK to approach military vessels.
B.
the ship was a civilian vessel and caused misunderstanding.
C.
the Egyptians did not understand the words of warning.
D.
no warning flare was fired by the U. S. navy on the ship.
【单选题】The wind was so strong last night that is tore the ______ of the ship into two or three pieces.
A.
mask
B.
mine
C.
sail
D.
satellite
【简答题】按压力分,阀门可分为: 、 、 、 和 。
【单选题】______ is the offense against navigational rules and will make the ship unseaworthy with the Shipowner responsible for all the consequences．
A.
Overloading
B.
Overtaking
C.
Overboarding
D.
Overlining
【单选题】按照压力分类，阀门可分为真空、低压、中压、高压和超高压阀门，其中低压阀门的压力为（）
A.
公称压力PN<1.6MPa
B.
公称压力PN<2.5—6.4Mpa
C.
PN10.0—80.0Mpa
D.
公称压力PN≥100Mpa
【简答题】按流体压力分类，阀门可分为真空阀、低压门、（）和（）。
【单选题】The permanent dunnage attached to the frames of the ship that aids in ventilation is（are）the ______．
A.
hatch boards
B.
tank top
C.
hatch beams
D.
sweat battens
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