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【多选题】
按失业状态的不同,失业可分为 。A.
完全失业
B.
显性失业
C.
部分失业
D.
隐性失业
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皮皮学刷刷变学霸
举一反三
【单选题】Listen to Track 67.
A.
It is not obvious how whales find their way.
B.
Different whales have different ways of locating food.
C.
Whales have a poor sense of orientation.
D.
Scientists have not been able to track the whales.
【单选题】Grey whales have long been _______in the north Atlantic and hunting was an important causes for that.
A.
deprived
B.
extinct
C.
detained
D.
extinguished
【单选题】Grey whales have long been ________ in the north Atlantic and hunting was an important cause for that.
A.
extincted
B.
extinguished
C.
detained
D.
deprived
【简答题】(16分)运用化学反应原理研究NH 3 的性质具有重要意义。请回答下列问题： （1）已知：①4NH 3 (g)+3O 2 (g)===2N 2 (g)+6H 2 O(g) H=-1266.8kJ·mol -1 ②N 2 (g)+O 2 (g)===2NO(g) H=180.5kJ·mol -1 写出氨高温催化氧化的热化学方程式 。 （2）氨气、空气可以构成燃料电池，其电池反应原理为4NH 3 +3...
【单选题】Grey whales have long been_____ in the north Atlantic and hunting was an important cause for that.
A.
deprived
B.
detained
C.
extinct
D.
extinguished
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