提睾反射的脊髓反射中枢在()
A.胸12
B.骶1~2
C.腰1~2
D.胸12至腰1
E.腰3~4
参考答案:C
—I'm so happy that you could come to England with us for the holiday.
—_______. It's the first time for me to be out of China.[ ]
A. I think not
B. Me, too
C. Thank you
D. All right
按照钻孔的位置、方向及长度,煤层注水方式可分为()。
A、长钻孔注水方式
B、短钻孔注水方式
C、深孔注水
D、巷道钻孔注水