伤寒病人发病第一周内，分离病原菌应采用的标本是
A．血液B．尿液C．粪便D．呕吐物E．脑脊液
参考答案：A
Alice fixed her eyes upon Bob, there was an expression __ that he could not understand.
A．in it
B．on them
C．in them
D．on it
ＸＤＰＳ系统中电源组件的种类与应用范围？
