反射弧的五个部分分别是感受器、传入神经、神经中枢、传出神经和                。

（）of the following need not be entered in the official logbook?

A.The testing of the internal combustion engine driven emergency generator at least once each month the vessel is navigated

B.The testing of storage betteries for emergency lighting and systems once each 6 months the vessels is navigated

C.The actual draft when the vessel arrives in salt water after department a port

D.The testing of the line-throwing appliance once every 3 months