伸缩缝安装与桥面高差的允许偏差为（）mm。
A.1
B.2
C.3
参考答案：B
上颌动脉供血的器官有()
A．上颌骨
B．下颌骨
C．舌
D．咀嚼肌
E．表情肌
—— Can Li Hua help me with my English?
—— I regret to tell you her English is＿＿＿＿＿yours.
A. as good as B. no more than . no better than D. as much as
