A.15 B.30 C.40 D.45
A.6/4 B.10/6 C.12/6 D.12/8
A.船舶由全速前進(jìn)變?yōu)榈购剿璧臅r(shí)間 B.船舶由全速前進(jìn)變?yōu)榇贋榱闼杌械木嚯x C.主機(jī)由全速前進(jìn)轉(zhuǎn)速降為轉(zhuǎn)速為零所需的時(shí)間 D.A或B