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【简答题】
同位素是指____相同,____不同的同一种元素的不同核素的互称。
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反馈参考答案：
举一反三
【单选题】在参与人体蛋白质构成的 20 种氨基酸中,以下说法正确的是
A.
全部是 L -型
B.
全部是 D 型
C.
部分是 L -型,部分是 D -型
D.
除甘氨酸外都是L型
【简答题】阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 The elephant and the fly An elephant was standing and picking leaves from a tree. A small fly came，flying and buzzing (嗡嗡叫) near his ear. The elephant waved it away with ...
【单选题】某工程施工过程中发生如下事件：①应恶劣气候条件导致工程停工2天，人员窝工20个工作日;②遇到不利地质条件导致工程停工1天，人员窝工10个工作日，处理不利地质条件用工15个工作日。若人工工资为200元/工日，窝工补贴为100元/工日，不考虑其他因素。根据《招标施工招标文件》(2007年版)通用合同条款，施工企业主索赔的工期和费用分别是( )。
A.
3天，6000元
B.
1天，3000元
C.
3天，4000元
【单选题】在参与人体蛋白质构成的 20 种氨基酸中,以下说法正确的是
A.
全部是 L －型
B.
全部是 D 型
C.
部分是 L －型，部分是 D －型
D.
除甘氨酸、脯氨酸外都是L- ɑ － 氨基酸
E.
以上都不对
【单选题】A liferaft which has inflated bottom-up on the water ______.
A.
should be righted by standing on the carbon dioxide cylinder，holding the righting straps and leaning backwards
B.
should be righted by standing on the life line，holding the righting straps leaning backwards
C.
will right itself when the canopy tube inflates
D.
must be cleared of the buoyant equipment before it will right itself
【简答题】An old porter (搬运工人) had worked for the railway for a very long time. One morning he was standing in one of the big railway stations and waiting for travelers to ask him to help them with their luggag...
【单选题】Which is NOT a solution given by the speaker?
A.
Working harder to prove your value
B.
Standing up when negotiating on the phone
C.
Looking into your boss' eyes
D.
Keeping your hand still
【简答题】阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。 While I was standing at the kitchen window, five-year-old Spencer, my oldest son, ran into the house 1 , “We need a doctor out here! We need a doctor! Hu...
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