the voltage between two points in a circuit
circuit continuity
current flow in a circuit
total or partial circuit resistance
第1题：
A sling psychrometer is a(n) ______.
A.type of cargo gear
B.instrument used in celestial navigation
C.instrument used to measure relative humidity
D.instrument used to measure specific gravity
第2题：
An aneroid barometer is an instrument ______.
A.used to measure the speed of wind
B.in which the pressure of air is measured
C.that tells which direction a storm is coming from
D.used to measure the height of waves
第3题：
________ is a device used to measure atmospheric pressure．
A.Barometer
B.Thermometer
C.Chronometer
D.Speedometer
第4题：
Compound gage
Bonrdon tube
Manometer
Deadweight gage
第5题：
90~0 kw
127~27 kw
155~70 kw
194~85 kw
第6题：
A check line is ______．
A.A safety line attached to a man working over the side
B.Used to measure water depth
C.Used to slow the headway of a barge
D.Used to measure the overhead height of a bridge
第7题：
a sponge used to mop up and store condensation must be kept salt free
only condensation on the bottom of the canopy should be collected
it should be strained through a finely woven cloth
chlorine tablets should be used to make it drinkable
第8题：
In the event of fire in a machinery space，______.
A.the fixed carbon dioxide system should be used only when all other means of extinguishment have failed
B.the fixed carbon dioxide system should be used immediately，as it is the most efficient means of extinguishment
C.water in any form should not be used as it will spread the fire
D.the space should be opened 5 minutes after flooding CO2 to prevent injury to personnel
第9题：
current
voltage
power
frequency
第10题：
temperature and pressure
humidity and temperature
pressure and vacuum
pressure and humidity