【单选题】根据《文物保护法》规定,历史上各时代的可移动文物分为珍贵文物和
【判断题】多吃海带、紫菜、海鱼等含碘丰富的海产品,可预防碘缺乏病。
【单选题】电动机的额定功率P N 应( )额定状态下输入的电功率,这是因为电动机有功率损耗所致。
【单选题】如果人体缺碘,就会发生甲状腺肿大,俗称“大脖子病”。过去我国缺碘人口达7亿多,从1994年起我国实行食盐加碘政策。推行加碘盐十多年后,大脖子病的发病率直线下降.但在部分地区,甲亢、甲状腺炎等甲状腺疾病却明显增多。有人认为,食盐加碘是导致国内部分地区甲状腺疾病增多的原因。 如果以下陈述为真,哪一项能给上述观点以最强的支持?
A.
我国沿海地区居民常吃海鱼、海带、紫菜等,这些海产品含有丰富的碘
B.
甲亢、甲状腺炎等甲状腺疾病患者应禁食海产品、含碘药物和加碘食盐
C.
目前,我国在绝大多数高碘地区已经停止供应加碘食盐
D.
某项调查表明,食盐加碘8年的乡镇与未加碘乡镇相比,其年均甲亢发病率明显增高
【单选题】The Great Pacific Garbage Patch
A.
This news report is about a huge area in the Pacific Ocean that is filled with mostly plastic garbage. The garbage collects there because the ocean currents bring it to that area. Itâs a serious problem for the environment because it affects all kinds of marine life.
B.
This news report really shocked me. I had no idea that our use of plastic was creating such a big problem. Thereâs a huge area of the Pacific Ocean full of plastic floating on the water. In my view, people need to use less plastic in their daily lives.
C.
In 1997, a sailor named Charles Moore discovered a large area of floating garbage in the Pacific Ocean near Hawaii. He estimated there were about 3 million tons of garbage. It was 100 feet deep.
【判断题】悬架一般由弹性元件、导向装置和、减振器三部分组成。
【判断题】电动机的额定功率应小于额定状态下输入的电功率,这是因为电动机有功率损耗所致。