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
参考答案:A
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.
的全微分dz为()。
A.A
B.B
C.C
D.D