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【简答题】
Directions: For this part, you are allowed 30 minutes to write a short essay entitled A Cover Letter. You should write at least 150 words following the outline given below. 1. 你是如何得知招生信息的 2. 自我推荐并说明选择该校的理由 3. 希望得到该校的回复
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皮皮学刷刷变学霸
举一反三
【多选题】以下关于动物细胞培养的说法正确的是
A.
培养细胞的最适温度为 37 ℃± 0.5 ℃，偏离此温度，细胞生长会受到影响，甚至导致死亡
B.
细胞培养的最适 pH6.2~7.4 ，当 pH 低于 6.0 或高于 7.6 时，细胞生长会受到影响，甚至导致死亡
C.
影响动物细胞培养的条件主要有培养基、气体、 pH 、温度、水质、渗透压及灭菌条件等
D.
在使用人工合成培养基培养细胞时，一定要添加 10% 的胎牛血清，对杂交瘤细胞的培养要添加 20% 的胎牛血清
【单选题】 关于培养基下列说法不正确的是
A.
可分为孢子培养基、种子培养基和发酵培养基
B.
种子培养基成分要容易吸收利用，成分丰富完整，总浓度略稀薄为宜
C.
孢子培养基有机氮源要高，以促进孢子产生
D.
发酵培养基要求组成丰富完整，还需要合成产物所需的特定元素、前体和促进剂等。
【简答题】It was the district sports meet. My foot still hadn’t healed(痊愈)from a(n) injury. I had whetherIt was the district sports meet. My foot still hadn’t healed(痊愈)from a(n)____injury. I had____whether o...
【单选题】I had to meet my mother at the railway station as she ______ before.
A.
had never been
B.
has never been
C.
has never come
D.
had never come
【单选题】I had to meet my mother at the railway station as she _______ before.
A.
had never been here
B.
has never been here
C.
has never come here
D.
had never come here
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