A: Could you tell me ____________ to the post office, please?

B: Yes. It’s down Bridge Street on your fight.

A．how I got

B．how I can get

C．how can I get

D．how did I get

在延长结焦时间，降低测温火道温度时，应保持边火道温度不低于（）。当大幅度延长结焦时间时，边火道温度应保持在（）以上。