【判断题】蛋白质由碳、氢、氧、氮四种元素组成,有些含磷、铁等其他元素。判断对错
【单选题】A vessel towing a barge astern would show,at the stern ______.
B.
a towing light above the stern light
C.
two towing lights in a vertical line
D.
two white lights in a vertical line
【单选题】( )实现中华民族伟大复兴梦坚实的制度保障
【多选题】有关淀粉、蛋白质和脂肪的组成说法正确的是 [ ]
D.
蛋白质和脂肪中一定都含有C、H、O、N四种元素。
【单选题】The ()(尾楼) deck is at stern.