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【单选题】
通过以下反应可获得新型能源二甲醚 (CH 3 OCH 3 ) 。下列说法不正确的是 1 C(s) + H 2 O(g) == =CO(g) + H 2 (g) Δ H 1 = a kJ·mol - 1 2 CO(g) + H 2 O(g) == =CO 2 (g) + H 2 (g) Δ H 2 = b kJ·mol - 1 3 CO 2 (g) + 3H 2 (g) == =CH 3 OH(g) + H 2 O(g) Δ H 3 = c kJ·mol - 1 4 2CH 3 OH(g) == =CH 3 OCH 3 (g) + H 2 O(g) Δ H 4 = d kJ·mol - 1A.
反应①、②为反应③提供原料气
B.
反应③也是 CO 2 资源化利用的方法之一
C.
反应 CH 3 OH(g) == = CH 3 OCH 3 (g) ＋ H 2 O(l) 的 Δ H ＝ kJ·mol － 1
D.
反应 2CO(g) ＋ 4H 2 (g) == =CH 3 OCH 3 (g) ＋ H 2 O(g) 的 Δ H ＝ (2 b ＋ 2 c ＋ d ) kJ·mol － 1
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【简答题】蜗杆传动标准中心距的计算公式为。
【单选题】' In my first week I had to make a presentation about food testing in front of 300 staff,' she recalls.‘They were bored for the whole time, mainly because I had no idea how to do it. This experience m...
A.
Right
B.
Wrong
C.
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【单选题】下列关于肺泡的描述正确的是
A.
肺泡壁由单层扁平上皮组成
B.
肺泡壁由单层立方上皮组成
C.
肺泡壁由Ⅰ型肺泡上皮细胞和Ⅱ型肺泡上皮细胞组成
D.
不具有气体交换功能
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