题目内容
低碳调质钢焊接冷裂纹倾向比中碳调质钢大。
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中碳调质钢热裂纹敏感性小。
中碳调质钢的淬硬倾向十分明显，冷裂倾向较为严重。
中碳调质钢一般都是在（）状态下使用的。
[音频]listen to the passage again and fill in the blanks.The disappearance of bees is a serious problem. It has a great_______on our food_______. Presently, scientists are still working to_______ why the bees are dying. Some think CCD is caused by the loss of bee’s_______ living space. Others think pesticide are_______ the bees.
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