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【判断题】
言、象、意问题最早出现在《周易》中。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
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【单选题】Miss Li is _____ than Mr Cheng in our school. [ ]
A.
much popular
B.
much more popular
C.
popular
【单选题】光电编码器在高速旋转测速中一般采用给定时间间隔T内对编码器的输出脉冲进行计数,这种方法测量的是_____,又称为M法测速
A.
最高转速
B.
瞬时转速
C.
平均转速
D.
最低转速
【简答题】动物细胞作为受体细胞进行外源基因的表达有何优点?
【多选题】动物细胞作为受体细胞的优点:
A.
能识别和除去外源真核基因中的内含子，剪切和加工成熟的mRNA。
B.
真核基因的表达蛋白在翻译后能被正确加工或修饰，产物具有较好的蛋白质免疫原性，约为酵母细胞的16～20倍。
C.
易被重组DNA质粒转染，具有遗传稳定性和可重复性。
D.
经转化的动物细胞可将表达产物分泌到培养基中，便于提纯和加工，成本低。
【单选题】Parents are advised to take pressure their chileren and give them some encouragement before an exam.
A.
off
B.
over
C.
from
D.
to
【简答题】动物细胞作为受体细胞进行外源基因的表达有何优点?
【简答题】Miss Cheng will never forget her first visit to Canada ,________?
【简答题】Some parents in China are sending their children to kindergartens to take foreign language courses; with a view to developing their kids foreign language skills, even though they have to pay up to 40,...
【单选题】Miss Cheng will never forget her first visit to Canada, ( )?
A.
will she
B.
won't she
C.
isn't she
D.
wasn't she
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