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【简答题】
化学与人类生活密切相关． （1）长期使用的暖水瓶内胆常有一层水垢，可以用厨房中的______调料除去． （2）厨房中下列物品的主要材料不属于有机合成材料的是______（填字母序号）． A．塑料盆       B．橡胶手套      C．棉布围裙      D．不锈钢蒸锅 （3）新装修的房屋常闻到装修材料中释放出的刺激性气味，人们能闻到这种气味的原因是分子______． （4）山区居民长期以当地硬度较高的山泉水为饮用水，饮用前人们都将水______． （5）PM2.5是指大气中直径小于或等于2.5微米的颗粒物．我国正加大对PM2.5污染物的监测力度． ①大雾天气导致呼吸病人增多，因为雾霾可使空气中增加大量的______（填字母序号）． A．二氧化硫     B．一氧化碳        C．二氧化氮    D．可吸入颗粒物 ②防PM2.5专用口罩中使用了活性炭，这是利用了活性炭的______作用．
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相关题目：
【单选题】主机滑油系统的自动清洗滤器一般位于 。
A.
滑油泵吸入管路上
B.
滑油泵排出管路上
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【单选题】In the generalized dividend model, a future sales price far in the future does not affect the current stock price because
A.
the present value cannot be computed
B.
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D.
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【单选题】血-胸腺屏障，不包含哪项
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毛细血管内皮和基膜
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胸腺细胞间的紧密连接
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血管周间隙及其中的巨噬细胞
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【单选题】血一胸腺屏障不包含哪一项( )。
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毛细血管内皮和基膜
B.
胸腺细胞问的紧密连接
C.
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【单选题】Predictable cycles in stock price movements
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tend to persist for a long time.
B.
tend to self-destruct as soon as investors recognize them.
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查看完整题目与答案
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UPDATE stock SET (status = NULL; quantity, price = 0) WHERE item LIKE S%
B.
UPDATE stock SET (status, quantity, price) = (NULL, 0, 0) WHERE item LIKE S%
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UPDATE stock SET status = NULL, SET quantity = 0, SET price = 0 WHERE item LIKE 'S%'
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UPDATE stock SET (status = NULL), (quantity = 0), (price = 0) WHERE item LIKE S%
查看完整题目与答案
【单选题】The authors note empirical evidence that shows cross-listing foreign shares of stock on U.S. exchanges has a positive stock price effect. ________ for the listing of ADRs.
A.
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B.
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C.
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D.
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查看完整题目与答案
【单选题】To make its stock price reasonable, Facebook has to____
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narrow the IPO price range
B.
cooperate with Google
C.
keep enormously profitable
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invest additional $ 2.6 billion
查看完整题目与答案