贵州江口县沼气池成农民“新宠”，多数家里装有沼气设备，做饭、烧水都用沼气。据测算，该县通过沼气、沼渣、沼液的综合利用，减少了化肥、农药的施用量，直接或间接实现农民增收2400多万元，成为农民增收的“聚财池”。农村发展低碳经济有利于（）
①节约资源、保护环境
②促进产业结构优化，推动走新型工业化道路
③推动农村经济发展
④统筹城乡发展，推动城镇化建设
| Mycorrhizal fungi infect more plants
than do any other fungi and are necessary for many plants to thrive, but they
have escaped widespread investigation until recently for two reasons. First, the
symbiotic association is so well-balanced that the roots of host plants show no
damage even when densely infected. Second, the fungi cannot as yet be cultivated
in the absence of a living root. Despite these difficulties, there has been
important new Work that suggests that this symbiotic association can be
harnessed to achieve more economical use of costly superphosphate fertilizer and
to permit better exploitation of cheaper, less-soluble rock phosphate.
Mycorrhizal benefits are not limited to improved phosphate uptake in host
plants. In legumes, mycorrhizal inoculation has increased nitrogen fixation
beyond levels achieved by adding pho A. lack of funding for such research B. lack of immediate application of such research C. difficulties surrounding laboratory production of specimens for study. D. lack of a method for identifying mycorrhizal fungi [判断题]水泵在无水情况下也可以运行。（）
A.正确 B.错误 [判断题]变更联锁关系和修改联锁电路必须经有资质的设计单位设计，并按权限审批。
A.正确 B.错误 [单选题]第二次国内革命战争时期,由于()的“左”倾教条主义的错误,造成第五次反“围剿”的失败。
A.罗章龙 B.张国焘 C.王明 D.李德 [简答题]“两个维护”是什么?
[简答题]简述当机车保护装置切除后，应如何处理？
[单项选择]法制要产生真正作用，还有赖于权力体系内外均衡力量格局的培育。当具体法规的执行人面对足以______他的力量时，他必须担心任何微小的违规与失误；而当客观上不存在足以制衡他的力量时，设计再精密的法规也可能被他任意______、歪曲，甚至视若无物。
填入划横线部分最恰当的一项是( )。 A. 约束 理解 B. 约束 解释 C. 监督 理解 D. 监督 解释 [单选题]《铁路旅客运输服务质量规范》中规定：动车组夜间运行时，不得进入卧车销售，座车可根据情况适当延长或提前销售时间，但不得超过（ ）小时。
A.1 B.2 C.半 D.1.5 [单项选择]《动车组列车服务质量规范》儿童票标高线长（）毫米。
A. 70 B. 80 C. 90 D. 100 我来回答: 提交
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