Room attendant should Wait 3 seconds for guest to respond and then knock a second time.
查看答案
Out of Order(OOO) means a guest is currently occupied in the room.
A. 对
B. 错
Stayover says the guest is not expected to check out today and will remain at least one more night.
A. 对
B. 错
在Windows环境下电子邮件有使用方式？
A. WWW方式
B. 客户端方式
C. Outlook Express方式
D. HTTP方式
微信支付 
支付宝支付