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【单选题】
关于分批培养不正确的是( )A.
细胞生长在固定培养基中,直至培养基中是养分为细胞耗尽为止
B.
用适当搅拌的方法增加和维持游离的细胞团在培养基中的均匀分布
C.
在成批培养的整个过程中,细胞数目会发生不断变化,呈现出从培养基开始起到,细胞增殖停止为止的细胞生长周期
D.
分批培养方法局限于实验规模
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举一反三
【简答题】(adopt) His ________ by the kind old man changed his whole life.
【单选题】What does the man want to do?
A.
Have his dog groomed
B.
Have his dog trained
C.
Adopt a pet for his sister
D.
Have a check-up for his dog
【简答题】用adopt, adjust 或adapt 完成句子。 1) All his suggestions have been____. 2) This TV series is____from a famous novel. 3)I must____my watch, as it's fast.
【单选题】人们在日常生活中大量使用各种高分子材料，下列说法正确的是
A.
天然橡胶易溶于水
B.
羊毛是合成高分子材料
C.
聚乙烯塑料是天然高分子材料
D.
酚醛塑料（俗称电木）不可以进行热修补
【简答题】案例六、某工地新进一批合成高分子三元乙丙橡胶防水卷材，材料员在施工用材料进人建 设工程被使用前必须进行检验验收。根据背景资料，回答下列问题： 三元乙丙橡胶防水卷材质量要求每卷不超过6处，每处面积不大于4mm2项目是 ( )。（单项选择题） A.折痕 B.杂质 C.胶块 D.凹痕 若工程的屋面防水等级为Ⅱ级，则该防水卷材的厚度不应小于( )mm。 （单项选择题） A.1.5 B.1.2 C.3 D....
【单选题】In writing an application, the writer should be ( ) and adopt an( )tone for his letter.
A.
unconfident,optimistic
B.
unconfident,inactive
C.
confident,optimistic
D.
confident,inactive
【简答题】I suggested he should ________ himself to his new conditions. A) adapt B) adopt C) regulate D) suit
【简答题】Why did the author adopt “Mark Twain” as his pen name?
【单选题】Which of the following strategies will a presenter NOT adopt to involve his or her audience?
A.
Telling generic jokes.
B.
Making a key-point pause.
C.
Asking the audience a question.
D.
Changing his or her presenting pace.
【判断题】热塑性弹性体,也成热塑性橡胶,是在常温下具有弹性,而在高温下具有塑性的一类新型高分子材料。其具有类似于橡胶的力学性能及使用性能,又能按热塑性塑料进行加工和回收的一类材料。
A.
正确
B.
错误
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