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【简答题】
现浇钢筋混凝土楼梯按梯段的传力特点,有 和 两种。
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举一反三
【单选题】An English exchange student in your college is learning Chinese, but he often uses 你好 when he speaks to your professors. What do you think or say?
A.
Isn’t he funny when he makes silly mistakes?
B.
I wonder if he knows the professors really well.
C.
“It’s very rude to use 你好 when you speak to a professor. You should show more respect.”
D.
“Your Chinese is excellent. By the way, you might like to say 您好 when you speak to your professors.”
【多选题】大肠杆菌作为受体菌表达真核生物外源基因时具有的劣势是
A.
缺乏真核RNA加工剪辑所需要的酶系统
B.
不能对真核生物蛋白质进行修饰加工。
C.
生产所有的真核生物蛋白质均无活性
D.
以上都不对
【简答题】幼儿探究活动虽然是不严谨的,但其探究的环节和科学家是相似的 。 是探究活动的开始; 猜想与假设是 ; 是寻找解决问题的证据,讨论是 。
【简答题】密度法测定的聚合物材料的结晶度和使用热焓法测定的结晶度,哪个方法所测得的值更高? 为什么?
【单选题】4 An English exchange student in your college is learning Chinese, but he often uses 你好 when he speaks to your professors. What do you think or say?
A.
Isn't he funny when he makes silly mistakes?
B.
I wonder if he knows the professors really well.
C.
"It's very rude to use 你好 when you speak to a professor. You should show more respect."
D.
Your Chinese is excellent. By the way, you might like to say您好when you speak to your professors."
【多选题】大肠杆菌作为受体菌表达真核生物外源基因时具有的劣势是
A.
缺乏真核RNA加工剪辑所需要的酶系统
B.
不能对真核生物蛋白质进行修饰加工。
C.
生产所有的真核生物蛋白质均无活性
D.
其余 都不对
【简答题】为什么真核生物基因不能在大肠杆菌中直接表达?在什么条件下才能表达?
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