提高blinn材质球的Recflectivity属性会对材质产生什么影响？（）
A.颜色变深
B.反射率增加
C.高光颜色变亮
D.颜色变淡
参考答案：B
根据汉语提示选择句子。
1. 自然公园里有一片森林。[ ]
A. There is a forest in the nature park.
B. There is a river in the nature park.
C. There is a lake in the nature park.
2. 城市里有一个自然公园。[ ]
A. There is a city in the nature park.
B. There is a nature park in the city.
C. There is a forest in the city.
3. 公园里有小路吗？ [ ]
A. Is there a path in the city?
B. Is there a path in the park?
C. Is there a river in the park?
在PLC梯形图中，紧靠右控制母线的元件是（）。
A.输出线圈
B.外部输入接点
C.内部继电器接点
D.以上皆可
