关于超导磁体的描述，错误的是（）A.属于电磁体 B.需要外部激励

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问题单项选择题

关于超导磁体的描述，错误的是（）

A.属于电磁体

B.需要外部激励电源维持超导线圈中的电流恒定

C.MR中使用最广泛的超导材料是铌-钛合金

D.工作在超低温环境

E.液氦用做制冷剂

答案

参考答案：B

排序题

读句子，排序。

( ) Hello, Mike. I'm Zhang Peng. What are you doing?

( ) Yes. It's in front of the post office (邮局).

( ) I'm watching TV. What about you?

( ) How can I get to the post office?

( ) You're welcome.

( ) Hello. This is Mike speaking.

( ) You can go there by No. 11 bus.

( ) I'm listening to music. What are you going to do tomorrow?

( ) Thank you.

( ) I'm going to the park with my parents. But where is the park? Can you tell me?

单项选择题

颅内原发性淋巴瘤辅助检查中哪项错误（）

A.血液中淋巴细胞增高

B.脑脊液蛋白增高

C.X线片肿瘤钙化多见

D.CT多为实性，明显均一强化

E.MRI无特征性表现