实验中需2mol/L的Na₂CO₃溶液950mL，配制时应选用的容量瓶的规格和称取Na₂CO₃质量是

A．1000mL，212g

B．950mL，543.4g

C．950mL，572g

D．500mL，286g

B/L is the abbreviation for______

A．letter of credit

B．buying contract

C．commercial invoice

D．bill of lading