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环毛蚓雌雄同体,自体受精。()

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TRIZ理论中,科学效应和现象的应用,对解决技术创新问题具有超乎想象的、强有力的帮助和支持。()

When comparing twin screw tug to single-screw tugs,which statement about a twin-screw tug

A. If one engine fails,you do not lose control of the tow
B. It is more maneuverable
C. It develops more bollard pull for the same horsepower
D. It is generally subject to more propeller damage from debris in the water

海星为后口动物。()

鸟类左右心室已有了分隔,因此,鸟类的血液循环已属于完全的双循环。()

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