以下哪些是民航乘务员必备的客舱安全技能
A. 客舱安全检查
B. 客舱安全演示
C. 紧急迫降及撤离
D. 客舱餐食供应
Proteins also occur in great variety; thousands of different kinds, ranging in size from relatively small peptides to huge polymers with molecular weights in the millions, may be found in a single cell.
A. 聚合酶
B. 聚合物
C. 多数者
D. 聚合
Moreover, proteins exhibit enormous diversity of biological function and are the most important final products of the information pathways.
A. 展览
B. 提出
C. 显示
D. 展出
Proteins are the molecular instruments through which genetic information is expressed.
A. 工具
B. 仪器
C. 乐器
D. 器械