目前我国保安服务已经从单一的人力保安，发展为（）、保安巡逻、

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问题单项选择题

目前我国保安服务已经从单一的人力保安，发展为（）、保安巡逻、保安押运、安全技术防范等四大主要业务。

A.保安守护

B.随身护卫

C.安全检查

D.秩序维护

答案

参考答案：A

排序题

重新排列句子，组成完整对话。

( ) Why not? We can take some pictures there.

( ) Yes, there is. In the park, the lake is blue, the trees are big, and the flowers are beautiful.

( ) Welcome to our city. There's a nature park in the city.

( ) Really? Is there a lake in the park?

( ) I want to see it! Let's go to the nature park.

单项选择题

的全微分dz为()。

A.A

B.B

C.C

D.D