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【单选题】
左手持钞动作拇指位置A.
右侧面上端
B.
右侧面中间
C.
右侧面下端
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举一反三
【简答题】How to define the specific gravity of the crude oil?
【判断题】The specific gravity of a gas is defined as the densities of the gas and air when both are measured at the same temperature and pressure.
A.
正确
B.
错误
【单选题】已知某正弦交流电压的表达式为:u=220 2 sin628t V,则此正弦交流电压的有效值和周期分别为________ 。
A.
2 V,314s
B.
220V,0.01s
C.
220V,50s
D.
2 V,0.02s
【单选题】_____ shows 1.2 meter and the specific gravity of the oil is 0.96According to the measuring scale, that makes 150 tons.
A.
The piston rod
B.
The push rod
C.
The sounding rod
D.
The connecting rod
【单选题】______ the weight and the specific gravity of a body, you can calculate its volume.
A.
Giving
B.
Gives
C.
Given
D.
Give
【单选题】The specific gravity of fuel oil is a ___
A.
absolute value
B.
relative value
C.
constant
D.
set value
【单选题】The specific gravity of fuel oil is a _____.
A.
absolute value
B.
relative value
C.
constant value
D.
set value
【单选题】已知某正弦交流电压:U=220V,f=50Hz,初相为60°,则其正确的瞬时表达式为( )
A.
u=220sin(50t+60°)V
B.
u=220sin(314t+60°)V
C.
u=311sin(50t+60°)V
D.
u=311sin(314t+60°)V
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