数据库是计算机系统中按一定的数据模型组织、存储和使用的______。
A．命令集合 B．程序集合 C．数据集合 D．文件集合
参考答案：C
用括号内所给单词的适当形式填空。
1. His _________(die) shocked the whole city.
2.We have made a____(decide) about it.
3.I saw Li Lei _________(chat) with our English teacher just now.
4. He _________(use) to play the piano, but he plays the violin now.
5. My neighbor is a quiet girl but I am____(talk).
公司将对符合以下哪些条件的客户强制平仓（）
A、客户信用账户内的担保物价值未达到公司规定维持担保比例且未按时补足
B、客户保证金可用余额小于零
C、客户融资融券合约到期未偿还时
D、客户信用账户维持担保比例低于130%时
