椎管内有占位的脊髓压迫症，要迅速减压或切除占位。急性脊髓压迫症减压应在（）
A.24h内
B.18h内
C.12h内
D.6h内
E.3h内
参考答案：D
工业打码操作流程为：（）、排产、读码、打码、码段回送.
—I can't find my keys.
—________. Let me help you find it.[ ]
A. that's OK
B. Have a good time
C. That's interesting
D. Don't worry
