Within two years, Elvis Presley became a well known singer throughout the nation.
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Because his career went downhill Elvis stopped performing and recording.
A. 对
B. 错
Elvis Presley showed through his music the most exciting part of rock and roll.
A. 对
B. 错
以下（）不是太阳辐射的特点。
A. 太阳辐射接近6000k黑体辐射
B. 太阳光谱辐照度按波长的分布具有不连续性
C. 太阳辐射的能量主要集中在热红外波段
D. 在距离太阳平均日地距离处太阳的辐射能量总值约为1.94k/（cm2•min）
绝对黑体的（）。
A. 反射率等于1
B. 反射率等于0
C. 发射率等于1
D. 发射率等于0
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