A:We go shopping.
B:He is a driver.
C:It's Sam's ruler.
如图所示实验装置,请按要求回答问题:
①玻璃棒②胶头滴管 ③100mL容量瓶④托盘天平⑤50mL烧杯⑥10mL量筒 ⑦100mL量筒.