UV光固化涂料是指靠()为能源对涂层中的活性成分激发生成自由基或质子酸的一种涂料。
A、激光
B、太阳光
C、红外光
D、紫外光
参考答案:D
Michael really has a gift ______ playing the piano so his teacher decided to make a pianist of him.
A.on
B.about
C.into
D.for
若黄赤夹角变小,则()
A.热带、寒带的范围变大
B.温带的范围变小
C.太阳直射的范围变小
D.热带、寒带的范围变小