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爬行动物如蛇体表的鳞片是皮肤真皮衍生物。()

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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。()

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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

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海星为后口动物。()

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