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【单选题】
银耳本身为淡黄色，某地生产的一种“雪耳”，颜色洁白如雪。制作如下：将银耳堆放在密闭状态良好的塑料棚内，棚的一端支口小锅，锅内放有硫磺，加热使硫磺熔化并燃烧，两天左右，“雪耳”就制成了。“雪耳”炖而不烂，对人体有害，制作“雪耳”利用的是 （ ）A.
硫的还原性
B.
硫的漂白性
C.
二氧化硫的还原性
D.
二氧化硫的漂白性
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反馈参考答案：
举一反三
【单选题】A vessel aground at night is required to show two red lights in a vertical line as well as （）.
A.
not under command lights
B.
restricted in her ability to maneuver lights
C.
anchor lights
D.
sidelights and a sternlight
【简答题】A vertical line at any point on the earth’s suce is the line that follows the direction of gravity at that point.
【简答题】A horizontal plane at a point is the plane that is perpendicular to the vertical line at the point.There is only one horizontal plane through a given point.
【单选题】[7-41]The ___is the point at which a vertical line through the heeled ship’s center of buoyancy intersects with the vertical line throu
A.
metacenter
B.
center of buoyancy
C.
Center of gravity
D.
center of flotation
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