体内物质转化和能量转化有赖于气的功能是（）。
A.推动作用
B.温煦作用
C.防御作用
D.气化作用
E.营养作用
参考答案：D
Which routing algorithm is described belowIt is a mechanism in which the sending station determines the route the frame will follow andincludes the routing information with the flame；bridges read the routing information to determineif they should forward the frame．
A．Fixed Routing
B．Spanning Tree
C．Source Routing
D．Frame Forwarding
关于我国古代冶金业的表述，正确的是：
①早期铜器主要是生产工具 ②我国较早冶炼生铁和块炼铁
③汉代冶铁开始使用煤炭做燃料 ④西汉时发明了水力鼓风冶铁装置 [ ]
A、①②
B、③④
C、②③
D、①④
