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【多选题】
商务礼仪中女士的唇彩的颜色应与（）的颜色相同A.
手提包
B.
腮红
C.
衬衣
D.
指甲
E.
套装
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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】______ 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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