库内绝对湿度受（）的影响.
A.库房建筑结构
B.储存商品状况
C.库房密封条件
D.以上均是
参考答案：D
26. When ______ the bookstore, they saw an advertisement reading “If you buy three books at a time, you’ll receive a fourth one as a _______.”
A. going into; reward B. going into; bonus C. went; favour D went; honour
在乙醇和乙酸的反应中，浓是
A．催化剂
B．氧化剂
C．吸水剂
D．反应物
是