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【单选题】
、将振动和碾压作用相结合的压实机械是()A.
脚碾
B.
碾
C.
胎碾
D.
动碾
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【简答题】I recently heard a story about a famous scientist who had made several very important medical breakthroughs（突破）. He was being interviewed by a reporter who asked him he thought he was able to be so mu...
【单选题】下列各组缓冲溶液中，缓冲容量最大的是( )。
A.
0.5mol·L -1 NH 3 和0.1mol·L -1 NH 4 Cl
B.
0.1mol·L -1 NH 3 和0.5mol·L -1 NH 4 Cl
C.
0.1mol·L -1 NH 3 和0.1mol·L -1 NH 4 Cl
D.
0.3mol·L -1 NH 3 和0.3mol·L -1 NH 4 Cl
【简答题】I recently heard a story about a famous scientist who had made several very important medical breakthroughs（突破）. He was being interviewed by a reporter who asked him 1 he thought he was able to be so ...
【简答题】完形填空。 I recently heard a story about a famous scientist who had made several very important medical breakthroughs.He was being interviewed by a reporter who asked him __ 1 __ he thought he was able to...
【单选题】3-下列溶液用酸碱滴定法能准确滴定的是 -( ) (A) 0.1 mol/LHF (pKa = 3.18) (B) 0.1 mol/L HCN (pKa = 9.21) (C) 0.1 mol/LNaAc [pKa(HAc) = 4.74] (D) 0.1 mol/L NH 4 Cl [pKb(NH 3 )= 4.75]
A.
0.1 mol/LHF (pKa = 3.18)
B.
0.1 mol/L HCN (pKa = 9.21)
C.
0.1 mol/LNaAc [pKa(HAc) = 4.74]
D.
0.1 mol/L NH4Cl [pKb(NH3)= 4.75]
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