第28题: [单项选择]Our son doesn't know what ______ to at the university; he can't make up his mind about his future. A. take in B. take up C. take over D. take after 参考答案:B 答案解析:[解析] A项take in意为“领会,接受,欺骗”;B项take up 意为“拿起,占据,开始从事”;C项take over意为“接收,接管,接任”;D项take after意为“与……相像”。
第29题: [单项选择]十字头式柴油机活塞组件装配后的技术要求是()。 A. 活塞外圆与活塞杆外圆同轴 B. 活塞环外圆与活塞杆外圆同轴 C. 活塞环槽端面与活塞中心线垂直 D. 活塞环槽端面与活塞杆中d线垂直 参考答案:A