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【单选题】
图中横坐标表示完全燃烧时耗用可燃气体X（X=A、B、C）的物质的量n（X）．纵坐标表示消耗O 2 的物质的量n（O 2 ），A、B是两种可燃气体，C是A和B的混合气化则C中n（A）：n（B）为（ ）A.
2：1
B.
1：2
C.
1：1
D.
任意比
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【简答题】下列改变仪器高法进行水准测量的外业记录手簿,请将表格中遗漏的数据补充完整。
【单选题】A user reports that the laser printer is constantly jamming on humid days. Which of the following is the MOST likely resolution to the problem?（）
A.
Replace the paper with thinner paper.
B.
Replace the toner cartridges.
C.
Replace the fuser.
D.
Replace the print heads.
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