庾信，字子山，他早年出入梁朝宫廷，擅作（）诗，风格华丽；晚年作品中表现出浓厚的乡关之思和（）的悲愤之情，风格（）。
参考答案：宫体；羁宦北国；苍劲沉郁
I don’t know________.
Because he has to look after his mother.
A．why he is leaving
B．why is he leaving
C．whether he is leaving
D．whether is he leaving
铣床主轴精度检验包括其运动精度及其有关部位的位置精度。
