更多"[不定项选择题]取苏木粉末加水，放置约4小时，时时振摇，滤过，滤液显橘"的相关试题:
[不定项选择题]取苏木粉末加水，放置约4小时，时时振摇，滤过，滤液显橘红色，置紫外光灯(365nm)下观察，显();滤液加氢氧化钠试液，显猩红色，置紫外光灯(365nm)下观察，显()。再加盐酸使成酸性后，溶液变为橙色，置紫外光灯(365nm)下观察，显()。
A.黄绿色;蓝色荧光;黄绿色
B.蓝色荧光;黄绿色;黄绿色
C.蓝色荧光;蓝色荧光;黄绿色
D.蓝色荧光;黄绿色;蓝色荧光
E.蓝色荧光;紫色;蓝色荧光
[单选题]取苏木粉末加水，放置约4小时，时时振摇，滤过，滤液显橘红色，置紫外光灯（365nm）下观察，显（ ）；滤液加氢氧化钠试液，显猩红色，置紫外光灯（365nm）下观察，显（ ）。再加盐酸使成酸性后，溶液变为橙色，置紫外光灯（365nm）下观察，显（ ）。
A.黄绿色；蓝色荧光；黄绿色
B.蓝色荧光；黄绿色；黄绿色
C.蓝色荧光；蓝色荧光；黄绿色
D.蓝色荧光；黄绿色；蓝色荧光
E.蓝色荧光；紫色；蓝色荧光
[单选题]浙贝母粉末置紫外光灯(365nm)下观察，荧光颜色是
A.A蓝紫色
B.B橙红色
C.C黄棕色
D.D亮淡绿色
E.E亮黄色
[单选题]淡水珍珠药材置紫外光灯(365nm)下观察，所显荧光的颜色是
A.浅蓝紫色
B.棕红色
C.亮绿色
D.天蓝色
E.棕黄色
[不定项选择题]患者汽车撞伤4小时，右上腹痛。查血压80/40mmHg，脉搏120次/分，右肋部皮肤擦伤，右上腹压痛明显，全腹轻度肌紧张，移动性浊音阳性，肠音弱，尿色正常。
应采取的治疗原则
A.输血补液，并用升压药物抗休克
B.抗休克待血压好转后手术
C.先抗休克后手术
D.抗休克同时手术
E.大量止血药物不手术
[不定项选择题]共用题干
Ants Have Big Impact on Environment as“Ecosystem Engineers”
Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators.The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.
Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil.This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.
Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.
Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”
“In this research,we studied for the first time how big this impact is and the subtleties of it.What we found is that despite being predators,their presence can also lead to an in-crease in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.
The study,carried out in Germany,studied the impact of the presence of different com-binations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area in-creased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.
Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counter-acting the positive influence via ecosystem engineering.”
Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obvi-ously reduces its richness. However,it is not clear how such disturbance damages the main-tenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.
What does paragraph 6 tell us?
A.Ants bring about a negative influence to an area when their population is small.
B.Ants bring about a positive influence to an area when their population is small.
C.Ants'predation counteracts the positive influence they may have on an area.
D.At higher density,ants produce a positive influence on an area.
