（）传力路线明确、受力合理，适用于荷载较大、楼梯跨度较大的房屋。
A.板式楼梯
B.梁板式楼梯
C.悬臂式楼梯
D.梁承式楼梯
参考答案：B
_____ we stood at the top of the building，we were able to enjoy the town below clearly.
A．As
B．Although
C．Unless
D．Until
保守稳健型投资者希望能通过投资来获利，并确保足够长的投资期间。( )
