题目内容
中碳调质钢的淬硬倾向十分明显，冷裂倾向较为严重。
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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.
多西环素是四环素类抗生素，可以治疗支原体与大肠杆菌的混合感染。
四环素类抗生素呈现抑菌作用。
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