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【多选题】
下列关于糖的分离叙述正确的是( )A.
季铵盐沉淀法：用于碱性多糖的分离。
B.
离子交换色谱：适用于分离酸性 , 中性多糖和粘多糖。
C.
纤维素柱色谱：兼有吸附色谱和分配色谱的性质。
D.
凝胶柱色谱：分离多糖 , 按分子大小不同分离。
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【单选题】Part B Directions: You will hear 3 conversations or talks and you must answer the questions by choosing A, B, C or D. You will hear the recording ONLY ONCE. 听力原文： As you all know，log structures are ga...
A.
Traditional European architecture.
B.
Techniques for building log cabins.
C.
The history of log structures.
D.
How to build a home yourself.
【单选题】Part B Directions: You will hear 3 conversations or talks and you must answer the questions by choosing A, B, C or D. You will hear the recording ONLY ONCE. 听力原文： As you all know, log structures are g...
A.
Traditional European architecture.
B.
Techniques for building log cabins.
C.
The history of log structures.
D.
How to build a home yourself.
【单选题】下列关于卵子结构特点叙述正确的是
A.
卵子的极性与重力因素无关
B.
卵巢内的初级卵母细胞全部被卵泡细胞所包围
C.
卵黄颗粒通常集中于动物极
D.
初级卵母细胞核位于植物极
E.
卵子的极性决定了不同部位的胚胎细胞演化为不同的组织与器官
【简答题】简述压电式传感器前置放大器的作用，两种形式各自的优缺点及其如何合理选择回路参数。
【单选题】Part B Directions: You will hear 3 conversations or talks and you must answer the questions by choosing A, B, C or D. You will hear the recording ONLY ONCE. 听力原文： Right, everybody. Welcome to Central ...
A.
Consult with her frequently.
B.
Use the computer regularly.
C.
Occupy the computer early.
D.
Wait for one's turn patiently.
【简答题】2015年,全国各省(自治区、直辖市)中高速路里程最多的是________。
【单选题】Part B Directions: You will hear 3 conversations or talks and you must answer the questions by choosing A, B, C or D. You will hear the recording ONLY ONCE. 听力原文：M: Now, I' d like to say that I think ...
A.
It's a dangerous proposal.
B.
It's a stupid proposal.
C.
It's an advantageous proposal.
D.
It's a viable proposal.
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