堆石坝坝体中,垫层区要求压实后内部渗透稳定,渗透系数为( )cm/s左右。
A.10-3 B.10-4C.10-5 D.10-6
参考答案:A
I didn’t mean to keep you waiting here for a long time. There are several traffic jams on the way. Can you ____ me?
A.apologize
B.interrupt
C.forgive
D.behave
脊髓髓外硬膜下病变最常见的是()。
A.蛛网膜囊肿
B.脊髓动脉瘤
C.神经鞘瘤
D.脊髓动静脉畸形
E.转移瘤