读新能源汽车产业链示意图,完成下列问题。
实验室制取二氧化碳气体,有如下图所示的仪器可供选用
请你回答下列问题:
It will be 20 years since Hong Kong returned to China on July 1,1997.(就划线部分提问)
____ ____years will it be since Hong Kong returned to China on July 1, 1997?