为避免眩光，可把光源的保护角控制在 ()
A3025度内
B3520度内
C3020度内
D3525度内
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显色优良的光源的显色指数为 ()
A<50
B>50
C<80
D>80
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
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