景深范围受到光圈、拍摄角度、拍摄距离、快门直接影响。
A. 正确
B. 错误
To determine what navigation lights and day-shapes must be displayed on mobile offshore drilling units under tow，you should check the（）.
American Bureau of Shipping classification rules
B. International Regulations for Preventing Collisions at Sea
C. Safety of Life at Sea Convention
D. Minerals Management Service rule
A motor enclosure which protects against falling liquids is classified as （）
A. waterproof
B. drip proof
C. spray tight
D. spray proof
室内装修、装饰，按照消防技术标准的要求，使用不燃、难燃材料。
A. 正确
B. 错误
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