增压防爆系统的进气端口应处于井场下风口。
参考答案：错
中国封建社会最后一个盛世是( )
A．文景之治
B．康乾盛世
C．贞观之治
D．开元盛世
Chen Dan is kind and is always . [ ]
A. ready to help others
B. ready for help others
C. ready to help the others
D. ready for help the others
