肠原性发绀者血中高铁血红蛋白含量为（）
A.>0.1%
B.>0.5%
C.>1%
D.>10%
E.>30%
参考答案：D
The manager was concerned to hear that two of his trusted workers _____.
A．are leaving
B．have left
C．were leaving
D．will leave
柴油机气阀间隙是在柴油机处在（）时测量.
A.热态；
B.冷态；
C.运行；
D.低速。
