软磁材料的特性是（）。A．磁导率高 B．矫顽率高 C．机械强度高 D．磁感应强度低

太湖水华具有明显的季节性变化，科研人员为了探究湖底底泥是否是引起水华的藻类种源的越冬场所，在冬季用柱状底泥采样器(外径60mm、内径52mm、高50cm)从太湖中采集柱状底泥。采样的每个泥柱总长40cm，将泥柱上层3cm段(编号HI)、中层10～13cm段(H2)和下层20～23cm段(H3)小心切出，立即取少量底泥置于干净的小烧杯中，加少许无菌水，充分混匀，静置1分钟后取上部液体进行显微检测，重复三次取样检测，采得各生物类群的物种数和个体总数如下表。请据表回答：

(1)某同学认为，为了减少显微检测时工作量，可只进行一次取样检测，你是否赞同这个观点？并说明理由。答：_____，______________。

(2)根据上表数据，判断下列叙述中正确的是___________。

A．上层底泥的藻类物种丰富度高于下层底泥

B．较上层与底层而言，中层底泥中的生物多样性最丰富

C．改用另一规格的常用底泥采样器会影响对比研究的结论

D．改变采样的时间会影响采集到的物种数和个体总数

(3)①．科研人员为了进一步确定底泥原样中是否存在某种藻类活细胞，将底泥样品接种到一定量的培养基中。在培养过程中应注意控制好__________等外界环境条件，在接种后的培养初期，培养基中的铜绿微囊藻种群数量呈________型曲线增长。培养过程中发现，在矿质营养等环境条件相同适宜的情况下，培养液中藻类密度过高时其净光合放氧率明显降低，主要原因是__________。

②．调查发现。铜绿微囊藻和广源小球藻在底泥中的分布较广，种群密度较高。培养表明，这两种藻类的环境适应能力最强。同时这两种藻类也是太湖夏季水华中的优势种和常见种。根据上述实验可以得出的结论是__________。

(4)水华发生时藻类大量繁殖，除了与气候因素有关外，还与氮、磷等藻类所需营养大量进入水体有关。某兴趣小组欲探究造成铜绿微囊藻大量繁殖的矿质元素种类，请写出主要的实验设计思路：____________。

重症社区获得性肺炎患者入住ICU后影响预后的因素有（）

A.发生脓毒血症休克

B.与肺炎无关的并发症

C.绿脓杆菌肺炎

D.初期治疗反应不佳

E.需机械通气，FiO₂＞0.6并需PEEP

男，20岁，上呼吸道感染后第10天发生全身水肿.尿少。查：血压，150/95mmHg，Hb120g/L，尿蛋白++，红细胞（+）/HP，白细胞O～2个/HP。下列何种疾病可能性大（）

A.慢性肾盂肾炎

B.慢性肾炎急性发作

C.急性肾小球肾炎

D.急性肾盂肾炎

E.急进性肾炎

· AC Milan star Kaka says a foot injury is still stopping him from returning to football. He has not played for 32 days. Kaka says he is in a lot of pain. "I hurt myself in an area that we always put pressure on." Kaka once played for a year with a knee injury, but the 26-year-old said this is much worse.
· British actress Emma used to spend more time filming than at school. But today she is ready to pay more attention to her studies. This 19-year-old girl will start at the Yale University in the autumn. "I always loved school. I just want to go back and find what else there is," she said.
· Chinese 25-year-old sports star Liu Xiang returned to Shanghai in March. He had a successful foot operation in December in Houston, and spent the next three months there for recovery and basic training. It is said that a group of doctors are ready to help with Liu’s recovery.
· Russian great tennis player Sharapova will not he playing in the MPS Group Championships, which begins in the US on Monday. Sharapova was missing the Sony Ericsson Open the week before last in Miami. She may continue training for the WTA Rome event at the beginning of May.

Which of the following is RIGHT

A．Emma started school at the age of 19.

B．Sharapova may play in the WTA Rome event.

C．Kaka was hurt by other players.

D．Liu Xiang returned to Shanghai for an a

肾小球滤过率（GFR）指：（）

A.单位时间内（每分钟）两肾生成的超滤液量

B.肾脏产生尿液率

C.肾脏过滤120L液体所需的时间

D.随着肾功能衰竭的进展而升高