【简答题】(3分)北京时间2013年12月2日1时30分,我国在西昌卫星发射中心用“长征三号乙”运载火箭,成功将“嫦娥三号”探测器发射升空。“长征三号乙”运载火箭(CZ-3B),简称长三乙,是中国目前运载能力最大、技术最先进、构成最复杂的运载火箭。它使用液态四氧化二氮(N 2 O 4 )和偏二甲肼(C 2 H 8 N 2 )作为推进剂 (1)有关偏二甲肼的说法不正确的是 ; a.偏二甲肼是氧化物 ...
【单选题】Suppose the Alaskan king crab harvest is unregulated and any person with a crab boat and some diesel fuel can go offshore, lower a crab pot, and harvest king crab. As a result, this common resource is...
A.
Alaska subsidizes the purchase of crab boats.
B.
Alaska auctions a limited number of licenses to harvest king crab.
C.
Alaska removes taxes on diesel fuel, which lowers the price of diesel.
D.
The U.S. and Canadian governments remove trade barriers, which allows for more trade of products like king crab.