问题
问答题 计算题
某套管内径φ124.3mm,外径φ139.7mm,问:横截面积是多少平方米?
答案
参考答案:
某套管内径φ124.3mm,外径φ139.7mm,问:横截面积是多少平方米?
参考答案:
从下面单词中选择合适的填空。 | |
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1. —What is it? —It is a . —Where is it? —It's the paper. | ![]() |
2. —What is it? —It's a . —Where is it? —It is the pencil case. | ![]() |
3. —What is it? —It's . —Where is it? —It's the blackboard. | ![]() |
4. —What is it? | ![]() |