[单选题] 提问人:匿名网友 提问时间:2021-08-22

According to the passage, how did knowledge about chemical processes increase before the seventeenth century?


A .Philosophers devised theories about chemical properties.
B .A special symbolic language was developed.
C .Experience led workers to revise their techniques.
D .Experts shared their discoveries with the public.

提问人:匿名网友 提问时间:2021-08-22

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