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请问什么是容载比?

During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?()

A. Flywheel inertia
B. Admission of starting air
C. The way of the vessel
D. securing of fuel to the cylinder

用于分离质粒 DNA的细菌培养浓度达到 0.8×10 细胞/ml 时,即可通过离心收集菌体。收集菌体使用定角转子,离心的速度以()为宜。

培养机智、敏锐和自信心,防止疑虑、孤僻,这些教育措施主要是针对()。

A. 抑郁质
B. 多血质
C. 黏液质
D. 胆汁质

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