The client with a lumbar laminectomy asks to be turned onto his side. What should the nurse do

A. Inform the client that because of his laminectomy, he may only lie supine.
B. Ask the client to help by using an overhead trapeze to turn himself.
C. Turn the client’s shoulders first, followed by his hips and legs.
D. Get another nurse to help log roll the client into position.

由于向斜构造区生成的断层常呈封闭性，瓦斯压力大，煤受搓揉破坏强度低，又积累着地质构造的弹性潜能，所以向斜构造区发生突出危险性（）。

A.较大

B.较低

C.为零