_____ the two designs, and you will find what problem there is with yours. [ ]

A. Comparing

B. Compared

C. To compare

D. Compare

利用下列实验装置能完成相应实验的是      

A．装置①制备Fe(OH)₂                  

B．装置②验证NaHCO₃和Na₂CO₃热稳定性

C．装置③量取8.5mL的稀硫酸           

D．装置④模拟铁的腐蚀