题干
He has been _______ for three weeks. We’d
better find another person to fill his place.
A：absent
B：left
C：gone
D：resigned
答案(点此获取答案解析）
A
Z(g)，经60s达到平衡，生成0.3mol Z。下列说法正确的是
两点分别对应实数 
，则下列结论正确的是（ ）
