问题
单项选择题
加压过滤和真空过滤的推动力哪个大（）。
A、加压过滤
B、真空过滤
C、一样大
答案
参考答案：A
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加压过滤和真空过滤的推动力哪个大（）。
A、加压过滤
B、真空过滤
C、一样大
参考答案：A
| 完形填空。 | |||
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