火车采样中的系统采样法，适用于每车采取的（）相等的情况。
A、子样
B、总煤量
C、总样
参考答案：A
The nurse is preparing a gastric lavage for a comatose victim of the car accident. Which of the following positions would be most appropriate for the client during this procedure
A．Trendelenburg's.
B．Lithotomy.
C．Lateral.
D．Supine.
细菌性食物中毒
