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A．Smaller circles.B．Bands of color.C．A large white disc.D．Curved legs of light.

A. Smaller circles.
Bands of color.
C. A large white disc.
D. Curved legs of light.

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盐析法沉淀蛋白质的原理是()。

A. 破坏水化膜，中和电荷
B. 无机盐与蛋白质结合成不溶性的蛋白盐
C. 降低蛋白质溶液的介电常数
D. 破坏蛋白质的一级结构
E. 调节蛋白质溶液的等电点

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When will the letter of credit be opened？

A. Within 10 working days from the date of the contract.
B. Within 20 working days from the date of the contract.
C. Within 30 working days from the date of the contract.

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听力原文：Man: Excuse me. I'd like to find out about flights to New York.
Woman: Well, let's see. One just left about five minutes ago; and there's another one at ten.
Man: What time is it, please？
Woman: It's five to eight.
Man: So the plane leaves in about two hours.
Woman: That's right. Have you bought your ticket？
Man: No, I haven't, Can I buy one here？
Woman: I'm afraid you can't. You'd better go to the hooking office.
Question 8: What time is the next flight to New York？
(13)

A. 10:00.
B. 9:55
C. 8:55
D. 2:00

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A．Its shape.B．Its size.C．Its location.D．Its brightness.

A. Its shape.
B. Its size.
C. Its location.
D. Its brightness.

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A．Smaller circles.B．Bands of color.C．A large white disc.D．Curved legs of light.

A. Smaller circles. Bands of color. C. A large white disc. D. Curved legs of light.

盐析法沉淀蛋白质的原理是()。

When will the letter of credit be opened？

A．Its shape.B．Its size.C．Its location.D．Its brightness.

A. Smaller circles.
Bands of color.
C. A large white disc.
D. Curved legs of light.