问题
单项选择题
直流干扰腐蚀最大的危害是发生（）。
A、点蚀
B、析氢反应
C、破坏防腐层
D、均匀腐蚀
答案
参考答案：A
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直流干扰腐蚀最大的危害是发生（）。
A、点蚀
B、析氢反应
C、破坏防腐层
D、均匀腐蚀
参考答案：A
| 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. |