You are on a large merchant vessel entering a port.There is a Pilot on board and he has the conn.Which statement is TRUE ________.
A. The Master is responsible for the safe navigation of the ship and the Pilot is employed for his local knowledge
B. The Pilot is solely responsible for the safe maneuvering of the ship only if he is required to be on board by law
C. The Pilot is solely responsible for the internal working of the ship
D. The Pilot becomes solely responsible for the safe navigation of the vessel only if the Master relinquishes the conn
步进电机采用三相六拍的通电方式，此时的步距角为30度()
难加工材料主要是指切削加工性差的材料，不一定简单地从力学性能上来区分。如在难加工材料中，有硬度高的，也有硬度低的。()
某初产妇，会阴侧切顺娩一活男婴，产后第4天，体温40℃，伴脉速，头疼，下腹疼痛，恶露有臭味，会阴切口红肿，双乳软，无硬结。
该产妇诊断为
A. 产褥感染
B. 乳腺炎
C. 上呼吸道感染
D. 盆腔炎
E. 败血症
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