饮水试验时患者饮用水的量为（）
A.10ml
B.20ml
C.30ml
D.40ml
E.50ml
参考答案：C
It's too late to go out now. ____, it's starting to rain. [ ]
A. Besides
B. However
C. Meanwhile
D. Anyhow
虽有细菌侵入，但未引起化脓性炎症者
A．无菌创口B．延期愈合创口C．感染创口D．工期愈合创口E．污染创口
