毛石砌体应分皮卧砌，各皮石块间应利用自然形状经敲打修整，从而使其与先砌石块基本吻合，搭砌紧密。( )
参考答案：对
When a bridge transmits an Ethernet frame, the Ethernet frame has （）.
A.the broadcast address for the its source address
B.the bridge's LAN address for its destination address
C.the bridge's LAN address for its source address
D.none of the above
严重肝功能不全时以下哪种激素灭活不受影响（）
A.雌激素
B.皮质醇
C.甲状腺激素（T4）
D.胰岛素
E.醛固酮
