There is a saying which _______like this:, “Still waters run ______.”

A．goes; deeply

B．comes; deep

C．goes; deep

D．comes; deeply

测定灰分和挥发分的马弗炉的恒温区至少（）年检定一次，高温计（包括毫伏计和热电偶）至少（）年校准一次。