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啤酒、红酒和白酒中都含有乙醇(C2H5OH),饮酒后乙醇可进入人体血液中,科学实验表明,当乙醇在人体血液中的含量超过80mg/100mL血(每100mL血中含有80mg乙醇)时,便会影响人的驾车或操作机器的能力;已知饮用某啤酒1大杯(0.56L),会使血液中乙醇含量升高30mg/100mL血.回答下列问题:
(1)乙醇中含有______种元素.
(2)乙醇分子中碳、氢、氧原子的个数比是______.
(3)李明饮用了3大杯上述啤酒后,其体内每100mL血液中乙醇的含量(理论上)升高______mg,______(填影响或不影响)其驾车或操作机器的能力.
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