妊娠高血压疾病发病率属于()
A.孕产妇保健工作统计指标
B.产科工作质量统计指标
C.妇女保健效果统计指标
D.计划生育统计指标
E.妇女病防治工作指标
参考答案:B
2007年11月8日,太阳直射在[ ]
A.赤道
B.回归线上
C.赤道和北回归线之间
D.赤道和南回归线之间
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