胃肠减压期间出现胃管堵塞，正确的处理方法是
A．更换胃管
B．加大负压吸引
C．停止负压吸引
D．盐水冲洗胃管
E．挤捏引流管
参考答案：D
by the advances in technology, many farmers have set up farms on their land.
A．Being encouraged
B．Encouraging
C．having encouraged
D．Encouraged
使用碟式制动之汽车，当制动踏板放松时煞，油管中须保持（）？
A.0psi
B.10psi
C.15psi
D.20psi
