第30题: [单项选择]What did the woman do this morning A. She had the cooker changed. B. She had her cooker repaired. C. She bought a new cooker. D. She returned her new cooker. 参考答案:A 答案解析:M: What’’s wrong with your new electric cooker Let me see if I can fix it.
W: Oh, I had the shop r
第31题: [单项选择]磨削铸铁时应选用( )砂轮。 A. 氧化物系 B. 碳化物系 C. 高硬磨料系 参考答案:B
第33题: [单项选择]肺窗有宽窗和窄窗之分,窄窗的窗宽和窗位分别是() A. W1500~2000,C-350~-500 B. W1350~1500,C-350~-500 C. W1350~1500,C-600~-800 D. W600~800,C-600 E. W350~500,C35~50 参考答案:D