— Hello, Mr. Smith. This is Larry Jackson. I am afraid I won't be able to arrive on time for

     the meeting in your office.

—  ________. We'll wait for you.

[      ]

A. Hurry up

B. No doubt

C. Cheer up

D. That's all right

在如图Ⅱ-3所示的锅炉总图及炉墙总图中，表示入孔的是______。