What is the verb of extension?
A. extend
B. extent
C. extensify
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What is the verb of compact?
A. compactify
B. compact
C. compactize
What is the verb of forecast?
A. forecast
B. forcasted
C. forcastness
What’s the adjective of female?
A. feminine
B. fem
C. effeminate
流动阻力有摩擦阻力与压强阻力之分。
A. 对
B. 错