A sea anchor is（）.

A.a heavy anchor with an extra long line used to anchor in deep water

B.a cone shaped bag used to slow down the wind drift effect

C.a padeye to which the sea painter is made fast

D.made of wood if it is of an approved type

以下哪一种疾病引起头痛，通常不会引起脑疝

A．脑肿瘤

B．脑出血

C．脑梗死

D．紧张性头痛

E．脑膜炎