肉毒梭菌致神经型食物中毒的机制是（）

A.肉毒梭菌侵袭肠黏膜

B.其产生的外毒素阻断胆碱能神经的传递

C.入血引起败血症

D.毒素引起的中毒性脑病

E.细菌引起的中枢神经系统感染

To ensure the ship’s general stability,（）.

A.she's loaded a little deeper forward

B.she's loaded a little deeper aft

C.she has not any ballast at all

D.the cargo is properly distributed throughout the ship