问题
单项选择题
在快速自旋回波(TSE)序列中()
A.回波链越长,扫描时间越长
B.回波链越短,扫描时间越短
C.回波链越长,扫描时间越短
D.回波链可以无限制地长
E.扫描时间与回波链无关
答案
参考答案:C
在快速自旋回波(TSE)序列中()
A.回波链越长,扫描时间越长
B.回波链越短,扫描时间越短
C.回波链越长,扫描时间越短
D.回波链可以无限制地长
E.扫描时间与回波链无关
参考答案:C
完形填空。 | ||||
Many children act in TV shows. They work several hours every day, (1)______ they can't go to regular (2)______. How do they get their schooling? In Hollywood, about forty (3)______ give lessons for the children. Their work is very (4)______. They make sure that the child (5)______ many different subjects. They make sure, (6)______, that the child gets enough (7)______ and play. Children in Hollywood must attend classes twenty (8)______ each week. If not, they can't (9)______ in TV shows any longer. TV children are usually (10)______ pupils, and most of their teachers (11)______ this kind of work. They give the pupils (12)______ in many interesting (13)______. Sometimes the "classroom" is a Mississippi (14)______. Sometimes it is the inside of a spaceship. Often the pupils become (15)______ stars. | ||||
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