下列评价杀虫剂的指标中代表杀虫剂药效好坏的是（）A.致死中浓度（LC50） B.致死

患者男，因“自幼多次出现皮下血肿、膝关节出血、牙龈渗血、上消化道出血”来诊。患者入院后实验室检查：活化部分凝血酶时间（APTT）100秒（正常30秒以内），血浆凝血酶原时间（PT）和血浆凝血酶时间（TT），纤维蛋白原正常，血小板计数和功能正常。家系图如图所示。

提示患者确诊为重型血友病A，多年来给予替代治疗，包括冷沉淀、血浆凝血因子Ⅷ（FⅧ）和重组人FⅧ。患者于近日出现牙龈出血不止，给予重组人FⅧ1000 U治疗2次后出血未见好转，检测发现患者伴有FⅧ抑制物，FⅧ抑制物定量7.6 BU。下一步应该给予的处理是（）

A.继续输注原剂量FⅧ治疗

B.改用凝血酶原复合物治疗

C.可用重组凝血因子Ⅶa（FⅦA.治疗

D.加用糖皮质激素

E.大剂量输注FⅧ的免疫诱导耐受治疗根除获得性抑制物

F.可加用抗纤溶药物

设AX=b为三元非齐次线性方程组，A至少有两行不成比例，α₁，α₂，α₃为AX=b的三个线性无关解，

则方程组AX=b的通解为( )

已挂警告牌的线路或设备,不准随意拆除。

Tourism and Environment in the Mediterranean The Mediterranean Countries as a whole account for one third of the world international tourism. In 1990, 72 million international tourists and 62 million domestic tourists visited the Mediterranean coastal region. Although the highest concentration has traditionally been on the northern shores, the trend is towards a more even distribution around the entire basin. At the same time, the Mediterranean Region -- characterised by its particular climate -- is considered as a terrestrial biodiversity "hotspot", this being defined as an area of exceptional endemism, having more than 1,500 vascular plants, and where over 70% of the natural habitat has been lost. In fact, the Mediterranean region largely meets these criteria, since it has about 13,000 endemic plants with only very little habitat left. Favourite tourist areas and biodiversity hotspots largely coincide in the Mediterranean coastal regions. This constitutes both an asset and a liability. The occupation of coastal areas by tourist infrastructures, including associated urbanisation, roads, marinas, golf courses, secondary homes, etc, leads to destruction of vulnerable terrestrial ecosystems and wetlands. Tourists demand water supply per capita at a higher rate than local inhabitants and at a time of water scarcity, in summer, thus leading to oversized facilities for both supply and treatment. Marine ecosystems suffer from water sports, anchoring, and waste disposal. Forest flies are multiplied by negligence and sometimes by criminal acts. These liabilities are however compensated by a major consideration, namely that all Mediterranean countries are heavily dependent on tourism to improve their balance of payments. Hence, the continued destruction of their coastal environments and natural amenities would jeopardise this much coveted tourism development. By 2025, in the case of a weak traditional development scenario, the number of domestic tourists in the Mediterranean region would reach 140 million and the number of international tourists 93 million, whereas in the case of a p and sustainable development scenario, these figures could reach 220 million and 143 million respectively. The challenge is to make such tourism development sustainable. In this respect, a greater attention to biodiversity can be most significant. More coastal ecosystems -- terrestrial and marine -- should be protected and existing protected areas should be strengthened. Management of these areas should include improved facilities for "interpretation" for visitors, including in marine, mountaineering and skiing resorts. More should be made of local biodiversity as a tourist attraction. Combination of cultural and natural elements, for instance in biosphere reserves, should be provided to tourists in the form of properly managed "ecotourism". Traditional agricultural products and crafts of quality should be promoted. If properly established the link between tourism and biodiversity in the Mediterranean constitutes a major asset for the region.

具有载氧功能的是（）

A.右旋糖酐

B.羟乙基淀粉

C.明胶制剂

D.全氟碳化合物

E.林格液