可压缩一元恒定流动运动微分方程是( )。A．(A) 质量守恒的表达式 B．(B)

关于便血下列叙述哪一项是正确的（）.

A.粪便颜色为黄色可断定无便血

B.下消化道出血时，血便多为暗红色

C.上消化道出血时，血便均为柏油样便

D.服用铋剂、铁剂后粪便隐血试验阳性

E.急性出血坏死性肠炎粪便呈果酱样脓血便

Don't _____ the TV. My baby is sleeping now. [ ]

A. turn on

B. turn off

C. turn down

__________ you promise to come to help me,I don’t mind what time tomorrow you arrive at my place.

A．So long as

B．So far as

C．As good as

D．As well as

医院火灾的逃生注意事项有哪些？

读图，填下表。