问题
填空题
直接影响超声耦合的因素是()以及()及()。
答案
参考答案:耦合层的厚度;探头、耦合剂;工件材料的声抗阻匹配
直接影响超声耦合的因素是()以及()及()。
参考答案:耦合层的厚度;探头、耦合剂;工件材料的声抗阻匹配
口语交际 根据上下文的意思,从下列表格中选择适当的句子完成对话。将句子的序号填写在横线上。
B: Just go straight and turn left. The post office is on the Bridge Street, next to a supermarket. A: 小题2: ? B: It’s about 20 minutes’ walk. But you can also take a bus to get there, if you like. A: 小题3: ? B: It’s over there. Look! Some people are waiting at the bus stop. A: I see. By the way, can I make a long-distance call (长途电话) at the post office? B: 小题4: . A: Thank you very much. B: 小题5: . |