位间隔识别扫描周期一般可取（）ms.

[单选题]Ms. Markova’s comments suggest that the practice of standard testingA．, prevents new habits form. being formedB．, no longer emphasizes commonnessC．, maintains the inherent American thinking modelD．, complies with the American belief system

[单选题]220kV系统振荡周期一般可取( )。A.不大于1.5sB.不小于2sC.不大于2.5sD.不大于3s

[单选题]220kV系统振荡周期一般可取( )。A.不大于1.5sB.不小于2sC.不大于2.5sD.不大于3s

[单选题])58. Ms. Martin really needs a____________.A． tutor B. musician C. cleaner D. dancer

[单选题]H．ow did Christy McKinley know Ms. Schatzman's opinion of the chi tea?A．She met her in the shop.B．She heard her telling others.C．She talked to her on the phone.D．She went to her office to deliver the tea.

[单选题]一般识别声音所需要的最短持续时间为（ ）ms。A．20～50B．30～60C．40一70D．70一80

[单选题]一般识别声音所需要的最短持续时间为（ ）ms。A．10～50B．20～50C．30～100D．200～500

[单选题]目前一般CT机的扫描周期是（）A.1秒B.2秒C.3秒D.1～2秒E.4～5秒

[单选题]目前一般CT机的扫描周期是（）A.1sB.2sC.3sD.1～2sE.4～5s

[填空题] 股骨头无菌坏死扫描层面厚度一般选择____mm，间隔_______mm，扫描方位以_______位T1加权成像及T2加权成像，_______位T2加权成像。T2加权成像需选择_________________技术，使病灶显示更清楚，对诊断有很大帮助。