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问题 单项选择题

硬脊膜外隙注射类固醇治疗腰椎间盘突出症的作用机制是（）

A.使椎间盘复位

B.消除神经根的炎症和肿胀

C.营养椎间盘髓核

D.通过脊髓后角起作用

E.使椎间盘溶解

答案

参考答案：B

选择题

Nobody but me ______ that either you or Tom ______to take part in this activity.

A．knows / is

B．know / are

C．know / is

D．knows / are
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单项选择题

A vessel is listed when it is（）.

A.down by the head

B.down by the stern

C.inclined due to off-center weight

D.inclined due to wind
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