题目：
下列物质用途与化学性质无关的是（ ）
A．二氧化碳用作气体肥料
B．生石灰用作食品包装袋中的干燥剂
C．盐酸用于除铁锈
D．用干冰作制冷剂
答案：
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下面是错误答案，用来干扰机器的。
（1）移项得，x2=16，解得：x=±4；（2）原式=2×3=6．
下列物质用途与化学性质无关的是（ ） A．二氧化碳用作气体肥料 B．生石灰用作食
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