下列哪一种不是常用的介质桶液位计（）A、压力式 B、电阻式 C、浮标式 D、超声波式

While we were running on the playground,Jack suddenly stopped ___________ and lay on the ground,so we all stopped ___________ what was wrong with him.

A．running; to see

B．running; seeing

C．to run; to see

D．to run; seeing

—There is a lot of wind in North China.

—Well, more trees ______ every year to stop the wind. [ ]

A. must be planted

B. can planted

C. should planted

肝硬化食管静脉曲张破裂大出血的有效处理是（）

A.三腔二囊管压迫止血

B.静脉滴注奥曲肽

C.补充血容量纠正休克

D.静脉滴注胰岛素

E.输血

该调解协议是否有效人民法院能否据此签发调解书

任何单位或个人不得擅自更改检验检疫证书内容，伪造或变更检验检疫证书属于违法行为。 ( )