数控铣床的准备功能中,逆圆插补的G代码为()。
A.G03
B.G02
C.G20
D.G30
参考答案:A
Hardly ________________ she heard the strange scream coming from behind a tree.
A.had she walked out of the woods than
B.did she walk out of the woods when
C.had she walked out of the woods when
D.she had walked out of the woods when
读“汽车产业链结构图”,结合所学知识,完成1~2题
1、从产业链角度看,P代表的产业最有可能是[ ]
A、配套产品生产(仪表、轮胎等)
B、汽车研发(发动机、变速箱等)
C、农机制造(拖拉机、农用车等)
D、能源加工(石油、天然气等)
2、影响汽车服务业布局的主导因素是[ ]
A、原料
B、市场
C、动力
D、劳动力