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道路建筑用石料按饱水抗压强度和磨耗率两项力学指标划分为4个等级，从1级到 4级，表示强度从弱逐渐到强。()
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听力原文：W: Mr. Johnson, have you heard the morning news report？ Mill has resigned his post as Prime Minister.
M: I didn't turn on the radio this morning, but I did see the headlines. If you remember, he threatened to leave the office at the last cabinet meeting.
Q: How did the man get the news？
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如心电图上出现连发的形态异常的QRS波群，最可能的诊断是
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参与全国银行间债券回购的非金融机构只可委托结算代理人进行债券交易和结算。 ()
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