— _______________________

— It's 4: 00.[ ]

A. What is it?

B. Who is that?

C. What time is it?

患者男性，34岁，7月5日发病，因频繁腹泻并呕吐l天来诊。大便呈水样，无明显腹痛。查体：血压70／40mmHg．神清，脱水征明显

诊断中最快捷有意义的检查是（）

A.大便常规

B.大便悬滴及制动试验

C.大便培养

D.大便涂片

E.呕吐物培养