群分出截面 group removal cross section

A、酸性气体排放量、大气中氢离子浓度、酸性气体减排政策 The acid gas emissions, the concentration of hydrogen ions in the atmosphere, acid gas reduction policy

B、矿产含硫量、脱硫设备除硫数量、清洁燃料政策 The sulfur content of minerals, the amount of sulfur removal from desulfurization equipment, clean fuel policy

C、经济规模、单位产值酸性气体排放量、酸沉降频率 Economic scale, the acid gas emissions per unit output , acid deposition frequency

D、降水PH值、酸沉降影响范围、酸雨受害构筑物修复管理 The PH value in precipitation, the impact range of acid deposition, the repair and management of acid rain damaged structure

TEXT B

When former President Ronald Reagan fell and broke his hip two weeks ago, he joined a group of more than 350,000 elderly Americans who fracture their hips each year. At 89 and suffering from advanced Alzheimer's disease, Reagan is in one of the highest-risk groups for this type of accident. The incidence of hip fractures not only increases after age 50 but doubles every five to six years as the risk of falling increases. Slipping and tumbling are not the only causes of hip fractures; weakened bones sometimes break spontaneously. But falling is the major cause, representing 90% of all hip fractures. These... ...

17. The following are all specific measures to guard against injuries with the EXCEPTION of

A. removal of throw rugs.

B. easy access to devices

C. installation of grab bars

D. re-arrangement of furniture

A.全进全出

B.分进分出

C.全进分出

D.分进全出

通常三相四线制线路中的中性线截面A₀与相线截面A_φ的关系可写为______；三相四线制线路中分出的两相线路的中性线和单相线路的中性线截面与相线截面之间关系为______

A.全进全出制

B.分进全出制

C.全进分出制

D.分进分出制

A.全进全出

B. 分进分出

C. 全进分出

D. 分进全出

A.全进全出制

B. 分进全出制

C. 全进分出制

D. 分进分出制

根据菌体(O)抗原的不同，目前已将霍乱弧菌分出200个以上的O血清群。其中哪些血清群引发霍乱

A．仅O1群

B．仅O139群

C．O1和O139群

D．仅O22群

E．仅O157群

根据菌体(O)抗原的不同，目前已将霍乱弧菌分出200个以上的O血清群。其中哪些血清群引发霍乱

A．仅O1群

B．仅O22群

C．仅O139群

D．仅O157群

E．O1和O139群