椎动脉型颈椎病的特点是:()。
A.头痛头晕,耳鸣眼花
B.声音嘶哑,吞咽困难
C.心率改变,听力下降
D.头部旋转时眩晕,甚至猝倒
E.上肢窜痛窜麻
参考答案:D
During the reconstruction of the city, many modern tall buildings went up _____ old shabby houses were
torn down. [ ]
A. where
B. in what
C. in which
D. which
自准直仪中,十字像的偏移量由反射镜转角所决定,与反射镜到物镜的()。