According to the passage, we can see that lower prices and better quality occur______.
A.as a result of the effect of one on the other
B.always at the same time
C.independently of each other
D.when the demand exceeds the supply
第1题
易燃固体按其燃点的高低、燃烧速度的快慢、放出气体的毒害性的大小可分()级。
A.二
B.三
C.四
D.五
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