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【判断题】
半波高度法用来测量小于声束截面的缺陷的尺寸。A.
正确
B.
错误
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举一反三
【简答题】A．The density of the water droplets in the air. B．The size of the water droplets. C．The temperature of the water droplets. D．The purity of the water vapor.
【简答题】[A]air[B]water [C]rest [D]warmth
【简答题】[A] air [B]water [C] rest [D]warmth
【单选题】The water cycle refers to the constant movement of water from land to sea to air and back again.
A.
Y
B.
N
C.
NG
【简答题】Air is to man what fish to water.
【简答题】The water circle refers to the ______ of water from land to sea to air and back again.
【单选题】The purpose of an air compressor unloading device is to _____.
A.
drain water from the air receiver
B.
drain water from the cylinders
C.
delay the compression process until the motor is up to speed
D.
check pump alignment
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