气相色谱－质谱联用仪的（）对载气中氧气的分压要求比较苛刻。
A.离子源
B.质量分析器
C.检测器
参考答案：A
As a writer, she succeeded in calling ______ to many of the terrible wrongs that existed at that time.
A．interest
B．attention
C．notice
D．mind
下列反射属于深层反射的是（）。
A.掌颏反射
B.下颌反射
C.腹壁反射
D.角膜反射
E.足跖反射
