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下列说法错误的是()。
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每升H2O中含10 mgCaCO3为1德国度(1゜)()。
滴定时,滴定管应该如何装滴定液()。
In talking to some scientists，particularly younger ones，you might gather the impression that they find the：“scientific method”a substitute for imaginative thought． It seems that some young scientists_________.
Well，no gains without pains，they say．But what about pains without gains? Everywhere you go in America．you hear tales of corporate revival．What is harder to establish is whether the productivity revolution that businessmen assume they are presiding over is for real． The author raises the question“what about pains without gains?”because
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