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【简答题】
氯气是普遍使用的氧化剂,既用于给水消毒,又用于废水( ),主要是起到消毒杀菌的 作用。 通常的含氯药剂有液氯、漂白粉、次氯酸钠、二氧化氯等。
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【单选题】Eric’s father, a skilled worker has repaired a lot of bikes of this kind, so he will _______ suc
A.
78. Eric’s father, a skilled worker has repaired a lot of bikes of this kind, so he will _______ succeed in repairing your bike, I suppose. A．probably
B.
may be
C.
maybe
D.
Perhaps
【单选题】Eric' s father, a skilled worker has repaired a lot of bikes of this kind, so he will______succeed in repairing your bike, I suppose.
A.
probably
B.
may be
C.
maybe
D.
perhaps
【单选题】—What's ________ job? —He's a teacher. [ ]
A.
you father's
B.
your father
C.
you father
D.
your father's
【简答题】根据句意完成句子。 1. We call mother's or father's brother ______. 2. We call mother's or father's sister ______. 3. Maomao's mother is my mother, but Maomao isn't my sister, but my ______. 4. Eric is my aunt'...
【简答题】水稻是世界重要粮食作物之一,在我国是第一大粮食作物,全国有近三分之二的人口以稻米为主食。在植物学分类上,水稻属于禾本科稻属,其种子由种皮、胚和胚乳三部分组成,种皮有保护作用,胚由胚芽、胚轴、胚根和子叶组成,胚乳是储存养料的结构,水稻所含的营养物质主要来自种子的胚乳。 水稻生产上使用的种子有两种类型:常规种和杂交种。我国北方地区多数种植常规种,南方地区多数种植杂交种。水稻杂交种是由被誉为“杂交水稻之...
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