题目内容

While steam-powered cars also had no____________(换挡), they suffered from long start-up time of up to 45 minutes on cold mornings.

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They had____________ (豪华内饰), with expensive materials, and averaged $3,000 by 1910.

.Most___________(汽车制造商) are also begin to develop electric vehicles.

大蒜SOD酶的提取分离应用了哪种蛋白沉淀技术？

A. 有机溶剂沉淀
B. 等电点沉淀
C. 盐析沉淀
D. 选择性变性沉淀

大蒜SOD酶的提取需要在（）下操作。

A. 高温
B. 低温
C. 常温
D. 没有要求