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【单选题】
测定石油类时，如果样品不能在24h内测定，应该______在条件下保存。A.
加氢氧化钠调pH＞10
B.
冰冻
C.
加盐酸调pH≤2并2～5℃冷藏
D.
加硫酸调pH＜2
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举一反三
【简答题】汽缸工作容积与燃烧室容积之和为汽缸总容积,汽缸总容积与燃烧室容积之比称为___。
【单选题】The following two paragraphs were written on the topic “The Best or Worst Job You Ever Had”. Both are unified and both are supported. However, one communicates more clearly and effectively. Which one,...
A.
Paragraph A
B.
Paragraph B
C.
Both of them
D.
None of them
【简答题】西红花的主产地为（ ）
【简答题】燃烧室容积与工作容积之和称之为 。
【简答题】The importance and focus of the interview in the work of the print and broadcast journalist is reflected in several books that have been written on the topic. Most of these books, as well as several c...
【简答题】13填空)燃烧室容积与工作容积之和称之为( ) 。
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