C90 Control of Operations

"Pour the third medicinal herb, Dark Horse, in first. Pour a third. After five minutes, a third. After ten minutes, a third. "The countdown begins now!" Weiqing patiently waited while he gave orders. Zhang Linlin looked at the bottles and jars on the table in a panic, "Is the Black Horse Company this black?"

Weiqing said angrily: "That's the green pot, quick! If you're too late