核磁共振波谱仪的基本结构和工作原理是什么？

补全对话。

Clark: What events do you ____1____ at your school?

David: We have an English Speech Contest each year.

Clark: ____2____ is it?

David: It's March 5th.

Clark: Do you have ___3_____ Art Festival?

David: Yes. It's March 17th. ___4___ we have a basketball game on March 10th.

Clark: When is your School Trip?

David: It's April 6th.

Clark: Is Linda's birthday ___5___in April?

David: Yes. It's April 18th.

晚上 没有 今天 月亮

国有独资公司既可以是有限责任公司，也可以是股份有限公司。（）

团体年金类保险的部分退保是指投保人可以在保险合同有效期内，对该合同下尚未（）的账户申请部分退保。

A.离职

B.退保

C.残疾领取

D.身故领取养老金

以下关于TD-LTE说法正确的是？（）

A.TD-LTE标准是一种国内标准

B.TD-LTE只能异频组网

C.TD-LTE核心网兼容2、3G

D.TD-LTE的核心网不能兼容FDD-LTE