腹部损伤未明确诊断前，护理措施的内容是
A．疼痛时予止痛剂
B．查腹部体征
C．监测BP、P、R
D．可进流质
E．半卧位休息
参考答案：B,C
They're out _____ milk. They must go to buy it. [ ]
A. on
B. at
C. for
D. of
级差式活塞空压机低压吸、排阀和高压吸、排阀（）。
A.高压吸、排阀设在缸盖上
B.低压吸、排阀设在缸盖上
C.A或B
D.A和B
