显色优良的光源的显色指数为 ()
A<50
B>50
C<80
D>80
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Lifesaving regulations require that a fire drill include ______.
A. staring the fire pumps
B. checking the operation of watertight doors
C. checking arrangements for abandon ship
D. All of the above
室内陈设的作用()
A参与空间组织
B烘托环境氛围
C体现环境特点
D反映业主个性
E彰显地域风情
Metacentric height is a measure of ______.
A. initial stability only
B. stability through all angles
C. maximum righting arm
D. All of the above
陶瓷是陶器与瓷器的总称。陶与瓷的主要区别有：()
A制胎原料不同
B亮度不同
C颜色不同
D釉色不同
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