如图所示为细胞中与基因有关的物质或结构,请分析并回答下列问题。
The doctor advises me to take the medicine t____ a day, in the morning and evening.
计算:(6xy2)(﹣2x2y)÷(﹣3y3)
设复数z满足(1﹣i)z=2i,则z=____