问题
单项选择题
涡流探伤速度太快时，由于难于形成（），以至会影响涡流探伤灵敏度.
A.载波
B.电磁波
C.调制波
D.平面波
答案
参考答案：C
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涡流探伤速度太快时，由于难于形成（），以至会影响涡流探伤灵敏度.
A.载波
B.电磁波
C.调制波
D.平面波
参考答案：C
| 根据句意，从方框内选择合适的单词填空。 | |
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| 1. We have _________ watched such an exciting football match before. 2. Lily’s grandmother has been dead _________ a few years. 3. My sister is going to Canada _________ a few days. 4. _________ you have got everything ready, please let me know. 5. —How long have you been like this? — _________ last night. |