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单选题
An aneroid barometer is an instrument（）.
A
used to measure the speed of wind
B
in which the pressure of the air is measured
C
that tells which direction a storm is coming from
D
used to measure the height of waves
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考题
单选题On what does the operation of an aneroid barometer depend?（）A
Thin，metal，air tight cellB
Curved tube containing alcoholC
Column of mercury supported by atmospheric pressureD
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考题
单选题A barometer showing falling pressure indicates the approach of a（）.A
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考题
单选题An aneroid barometer reading should be corrected for differences in（）.A
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wind speedD
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单选题An aneroid barometer on a boat should always be（）.A
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mounted in the passenger compartmentC
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单选题Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.A
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demagnetize the metal elementsC
bring the pointer to its true positionD
contract and expand the glass face
考题
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used to measure the height of waves
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单选题An instrument useful in predicting fog is the（）.A
sling psychrometerB
microbarographC
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aneroid barometer
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check it with a barometer on another vesselB
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考题
单选题As a high pressure system approaches，the barometer reading（）.A
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考题
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单选题He read the _____ carefully before assembling the instrument.A
instructionsB
directionsC
noticesD
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