每个楼梯段的踏步数一般不应小于()级。
A. 9
B. 12
C. 15
D. 18
Production of mechanical foam by a portable in-line foam proportioner().
A. increases the size of foam bubbles formed
B. increases the rate of foam production
C. improves the extinguishing properties of foam
D. gives the nozzleman more freedom of movement,since it can be placed anywhere in the hose line
患者,男性,20岁。不慎从3楼跌下,右耳流血性液体,嘴角歪向左侧,应考虑为()
A. 鼓膜穿孔
B. 颞骨线形骨折
C. 颅前窝骨折
D. 颅中窝骨折
E. 颅后窝骨折
微软公司在清华大学建立了“微软一清华多媒体实验室”,这种研发模式称为()。
A. 联合开发
B. 建立联盟
C. 共建机构
D. 项目合作