To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A. should be correctly carried out
B. should correctly be taken place
C. should carded with care
D. must to carry out with great care
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T12A钢淬火温度在（）℃间，再经低温回火后其金相组织为（）。
面肌痉挛为阵发性不规则的一侧面部肌肉__________为特点的疾病。
苯丙酮尿症是一种常见的_________代谢病，属常染色体_______遗传。
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