体内样品前处理的方法有
A. 去除蛋白质
B. 化学衍生化
C. 缀合物的水解
D. 分离纯化与浓缩
Questions 1[音频]
A. Half of the world needs to take the water issue seriously.
B. Water safety is something the world must take action on.
C. Water is linked to creating jobs and conditions of work.
D. Protecting the environment is important to access to water.
Questions 2[音频]
A. The wealth gap.
B. Poor health care.
C. Slow economic development.
D. Unequal water resources.
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