大型机械设备基础就位安装前,需要进行预压。预压的重量为自重和允许加工件最大重量总和的 ( )倍。
A.1.15
B.1.20
C.1.25
D.1.30
参考答案:C
Susan decided not to work on the program at home because she didn’t want her parents to know what she______ .
A.has done
B.was doing
C.had done
D.is doing
CT成像的优点除外()
A.图像清晰
B.不用造影剂增强即能显示肌、血管以及肿瘤的浸润范围
C.可区分肿瘤的良恶性
D.层面连续,对骨组织病变显示好
E.定位准确