共找到 212 与－－－－－－－Oh 相关的结果，耗时24 ms
溶液中[OH-]浓度为1.0×10-4mol/L时，其PH值为（）。A.PH=4.00B.PH=10.00C.PH=1.00D.PH=12.00
酸碱中和反应的实质是：H++OH-= H2O此题为判断题(对，错)。
长期停运的阴树脂存放时应将其转变成OH-。此题为判断题(对，错)。
------- What is the price of petrol these days-------Oh, it ______ sharply since last month.A. is raisedB. has risenC. has arisenD. is increased
---Sorry, Professor Smith. I didn't finish the assignment yesterday.---Oh, you_______ have done it as yesterday was the deadline.A. mustB. mustn'tC.
用NA表示阿伏加德罗常数的值。下列叙述正确的是A.25℃时，pH＝13的1.0 L Ba（OH）2溶液中含有的OH-数目为0.2 NAB.标准状况下，2.24 L Cl2与过量稀NaOH溶液反应，转移的电子总数为0.2 NAC.室温下，21.0 g乙烯和丁烯的混合气体中含有的碳原子数目为1.5 N
-- Ann is in hospital.-- Oh, really? I __ know. I __ go and visit her.A. didn’t; am going to B. don’t; wouldC. don’t; will D. didn't; will
-------Do you have enough to ________ all your daily expenses?--------Oh yes, enough and to spare.A. cover B. spend C. fill D. offer
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