湖南省2021研究生报考条件要求有哪些?

按照购买力平价（PPP）计算，IMIF估计2014年中国GDP将达17.6万亿美元，超过美园17.4万亿美元的GDP规模，成为全球第一大经济体。而根据世界银行统计数据，2013年我国GDP总量只有9.24万亿美元。基于上述材料回答：
(1)什么是购买力平价?

(2)购买力平价的合理之处是什么?

(3) 购买力平价的缺陷是什么?

男性，60岁，煤矿工人，近10年来出现憋气、心悸、口唇青紫。X片检查，肺门部可 见较密集的结节，多数直径小于1cm。不符合该患者疾病描述的是
A.可引起呼吸衰竭 B.可合并肺结核
C.可合并肺源性心脏病 D.可合并间皮瘤

“The ancient Hawaiians were astronomers,”wrote Queen Liliuokalani,Hawaii's last reigning monarch,in 1897.Star watchers were among the most esteemed members of Hawaiian society.Sadly,all is not well with astronomy in Hawaii today.Protests have erupted over construction of the Thirty Meter Telescope（TMT）,a giant observatory that promises to revolutionize humanity's view of the cosmos.At issue is the TMT's planned location on Mauna Kea,a dormant volcano worshiped by some Hawaiians as the piko,that connects the Hawaiian Islands to the heavens.But Mauna Kea is also home to some of the world's most powerful telescopes.Rested in the Pacific Ocean,Mauna Kea's peak rises above the bulk of our planet's dense atmosphere,where conditions allow telescopes to obtain images of unsurpassed clarity.Opposition to telescopes on Mauna Kea is nothing new.A small but vocal group of Hawaiians and environmentalists have long viewed their presence as disrespect far sacred land and a painful reminder of the occupation of what was once a sovereign nation.Some blame for the current controversy belongs to astronomers.In their eagerness to build bigger telescopes,they forgot that science is not the only way of understanding the world.They did not always prioritize the protection of Mauna Kea's fragile ecosystems or its holiness to the islands'inhabitants.Hawaiian culture is not a relic of the past；it is a living culture undergoing a renaissance today.Yet science has a cultural history,too,with roots going back to the dawn of civilization.The same curiosity to find what lies beyond the horizon that first brought early Polynesians to Hawaii's shores inspires astronomers today to explore the heavens.Calls to disassemble all telescopes on Mauna Kea or to ban future development there ignore the reality that astronomy and Hawaiian culture both seek to answer big questions about who we are,where we come from and where we are going.Perhaps that is why we explore the starry skies,as if answering a primal calling to know ourselves and our true ancestral homes.The astronomy community is making compromises to change its use of Mauna Kea.The TMT site was chosen to minimize the telescope’s visibility around the island and to avoid archaeological and environmental impact.To limit the number of telescopes on Mauna Kea,old ones will be removed at the end of their lifetimes and their sites returned to a natural state.There is no reason why everyone cannot be welcomed on Mauna Kea to embrace their cultural heritage and to study the stars.
Mauna Kea is deemed as an ideal astronomical site due to____

A.its geographical features.
B.its protective surroundings.
C.its religious implications.
D.its existing infrastructure.

神经调节的特点是
A.调节幅度小 B.作用广泛而持久
C.作用迅速、准确和短暂 D.反应速度慢