【简答题】系统误差包括如下几方面误差: 、 、 、 。系统误差的特点是 和 。偶然误差的特点是 和 。
【简答题】系统误差包括 误差、 误差、 误差。系统误差的特点是 ;偶然误差的特点是 。
【单选题】When the author was confronted with misfortunes, he ____.
A.
once even wanted to commit suicide
B.
was still hopeful at first
C.
divorced his wife voluntarily
D.
could support his family
【单选题】“海上明月共潮生”这一句的“句眼”是哪一个字: