气体灭火系统管道末端采用防晃支架固定，支架与末端喷嘴间的距离不大于（）。
A．300mm
B．400mm
C．500mm
D．600mm
参考答案：C
货币政策工具主要包括( )等一般性政策工具。
A．贴现率和再贴现率B．利率、汇率和贴现率C．利率、汇率和存款准备金率D．存款准备金率、再贴现率和公开市场业务
--- The party is so great!
--- Yes, but Johnson, we’ve got to go home. ______
--- Thank you. See you later.
A．Enjoy yourself!
B．See you.
C．I’m very sorry.
D．What about you?
