建筑物内的防火墙不应设在转角处。如设在转角附近，内转角两侧上的门窗洞口之间最近的水平距离不应小于()m。
A、3
B、4
C、5
D、6
参考答案：B
膨胀循环系统主要包括：膨胀塔、（）、工艺风机、废气风机、气锁等。
Can you make sure _____________ the gold ring?
A．where Alice had put
B．where had Alice put
C．where Alice has put
D．where has Alice put
