单项选择题
螺旋桨有四个桨叶。 （）
A. The helm has four blades.
B. The propeller has forty blades.
C. The windlass has four blades.
D. The propeller has four blades.
相关考题
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单项选择题
从船艏贯穿至船艉的甲板叫主甲板。（）
A. The deck from bow to stern is called the main deck.
B. The deck from stern to bow is called the tweendeck.
C. The deck from bow to stern is called the upper deck.
D. The deck from stern to bow is called the lower deck. -
单项选择题
底漆用于出白金属表面， 防止其生锈。（）
A. Topside paint is applied to a bare surface to give protective against rust.
B. Undercoat is applied to a bare surface to give protection against rust.
C. Primer coat is applied to a bare surface to give protection against rust.
D. Topcoat is applied to a bare surface to give protection against rust. -
单项选择题
用敲锈锤敲去厚锈。（）
A. Heavy rust is removed with a chipping hammer.
B. Loose paint and scale is removed with a scraper.
C. Heavy rust is removed with a scraper.
D. Loose paint and scale are removed with a chipping hammer.
