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【简答题】
写出下列分子或离子的共轭酸 SO 4 2- , B(OH) 4 - , HPO 4 2- , NH 3 , HNO 3 , H 2 O 2 . 根据质子理论,下列分子或离子哪些是酸?哪些是碱?哪些既是酸又是碱? HS - ; CO ; H 2 PO ; NH 3 ; H 2 S ; HAc ; OH - ; H 2 O ; NO 。
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【单选题】There is no doubt that we are living in a period of enormous population growth. In the past, it(51)thousands of years for the world's population to double in size.(52)today there are more people havin...
A.
spent
B.
cost
C.
took
D.
consumed
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