生物体内核酸和蛋白质两种大分子均能吸收紫外光,但最大吸收峰不同。
查看答案
核酸变性时紫外吸收值明显增加。
A. 对
B. 错
下面哪个不是“社交达人”的表现?
A. Self-confident.
B. Lack of security.
C. Optimistic.
When you want to call on somebady, you had better.
A. go quickly.
B. go there earlier.
C. call him up first and reach an arrangement.
What gifts to bring when you visit someone in America?
A. Flower.
B. Red envelope.
C. Wine.
D. Biscuit.