简述加油机编码器组成？
参考答案：
加油机编码器是一种工作在爆炸性气体环境用电气设备。包括：壳体，为帽状，其中央开有第一孔，所述壳体一侧具有与外界联通的接口；盖体，为帽状，其中央开有第二孔，所述盖体与上述壳体扣合，在两者的内部形成隔爆腔；转轴，所述转轴穿过所述壳体的第一孔和所述盖体的第二孔，从而贯穿穿过所述隔爆腔，所述转轴穿过所述第一孔的一端为输出端，穿过所述第二孔的一端为输入端，所述转轴上位于隔爆腔内的位置设置有码盘。该编码器壳体结构提供有输出端，可以外接加油机机械累计计数器，从而对加油机进行机械计数.此外还具有多个隔爆结合面，可以有效的提高编码器的安全性。
| 根据对话内容及方框中所给的句子补全对话。其中有一项是多余的。 | |
| (After class, Wang Feng is having a conversation with his foreign teacher Alice from America.) Wang Feng: You know, how to get along with others is very important in our daily life. Alice: Yes.1._______ Wang Feng: I am going abroad. 2._______ Alice: OK. "Good morning.good afternoon, good evening!" are said to one you know or anyone you are passing quickly. "How do you do?" is used when you are not in such a hurry in formal occasion ( 正式场合). 3._______ Wang Feng: In your country, what should you do when you meet 'someone for the first time? Alice: Shake hands. Wang Feng: How to shake hands? Alice: Adults offer hands to children first.A woman offers her hands first.An older person initiates a handshake with a younger one. The more important person is the first to offer his or her hand. Wang Feng: 4._______ Alice: A man is always introduced to a woman. The younger is always introduced to an older, and a less important person is always introduced to a more important one. Wang Feng: Thank you for telling me so much about western manners. Alice: 5._______ | |
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