手工研磨气门与气门座的工作面处一条整齐灰色的光环的环带（），在洗去研磨砂，涂上机油研磨几分钟即可
A、接触面宽度，进气门1.8～2.2mm，排气门2～2.3mm
B、接触面宽度，进气门1.5～2.2mm，排气门2～2.5mm
C、接触面宽度，进气门1～1.5mm，排气门1.5～2.2mm
D、接触面宽度，进气门0.5～1mm，排气门1.5～2mm
参考答案：D
| 根据对话情景选择恰当的选项，其中有两项是多余的。 | |
B: 1 I like it best. A: I'll have some orange juice. 2 Pizza here tastes wonderful. B: But I like cookies. There are many kinds of cookies at this restaurant. 3 A: Yes, they are delicious. B: I want to have salad, too. I like fruit salad. Please pass me a plate. A: 4 B: Thank you. A: I'd like some ice cream. Would you like some, too? B: 5 A: OK. Let's have our dinner. |