耐候性能试验后反光膜光度色度指标的测试角为( )。
A. 观测角为0.1°、人射角为-4°、15°和30°
B. 观测角为0.2°、人射角为-4°、15°和30°
C. 观测角为0.5°、人射角为-4°、15°和30°
D. 观测角为1.0°、人射角为-4°、15°和30°
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反光膜白天的色度性能指标有( )。
A. 昼间色
B. 表面色
C. 色品坐标
D. 亮度因数
盐雾试验后,反光膜表面不应有( )。
A. 变色
B. 渗漏
C. 起泡
D. 被侵蚀
Why was Mr.Forest unhappy in 2010?
A. Because people wanted to become rich.
Because people went out to have too much fun.
C. Because people spent too much time enjoying nature.
D. Because people spent too much time inside their homes.
Why did Mr. Fenn do then?
A. He hid a box full of treasure for people to find.
B. He gave money to people who were successful in life.
C. He gave two million dollars to people who explored the world.
D. He encouraged people to visit the Rocky Mountains of the US.
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