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【单选题】
关于正规性科学活动特点的说法中,错误的是( )
A.
学习内容统一、固定,由教师选择
B.
B .学习过程中教师的间接指导较多,时间和空间不受限制
C.
C .学习材料由教师统一提供,所有儿童共同操作
D.
D .学习的形式以集体教学为主
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【单选题】不属于调节组织特异性基因的转录起始的转录起始前复合物组分的是?
A.
RNA聚合酶
B.
普遍转录因子
C.
共激活/抑制因子
D.
DNA复制起点
【单选题】In applying the “front-page-of-the-newspaper” test to a contemplated course of conduct one should ask:
A.
Would I be found criminally liable if this winds up on the front page of the newspaper?
B.
Would I be liable for monetary damages if this winds up on the front page of the newspaper?
C.
Would I be willing to have my spouse, friends, and children read about this if it winds up on the front page of the newspaper?
D.
Would I be able to explain this to the authorities if it winds up on the front page of the newspaper?
【单选题】局域网接入Internet必须遵守的协议是( )
A.
TCP/IP
B.
NetBI0S
C.
IPX
D.
SPX
【单选题】下列属于真核生物转录特点的是
A.
转录与翻译同步进行
B.
转录与翻译不能同步进行
C.
σ因子辨认转录起始点
D.
Rho因子协助终止转录
E.
核心酶催化产物延长
【多选题】属于转录的特点的是 。
A.
单向性
B.
对称性
C.
不对称性
D.
连续性
E.
半不连续性
【单选题】A lot of newspaper readers do not even read the front page anymore because______.
A.
they don't have time
B.
they are lazy
C.
the front page is not attractive enough
D.
the headlines are too horrible and frightening
【判断题】当演讲时遇到恶意挑衅不需要反抗。()
A.
正确
B.
错误
【单选题】Who looks after the paper, especially the front page, in the afternoon and evening, preparing for the next morning?
A.
The Assistant Editor.
B.
The head of the department.
C.
The Night Editor.
D.
The Deputy Editor.
【判断题】以下说法是否正确: 气门弹簧 气门弹簧负责以可控方式关闭气门,就是说必须确保气门随凸轮一起运动,以使其即使在最高转速时也能及时关闭。此外,其作用力也必须足够大,以防止气门关闭(又称气门跳动)后振动。气门开启时,气门弹簧必须防止气门与凸轮脱离。
A.
正确
B.
错误
【简答题】列出p-n-p-n二极管的三种从阻断态到导通态的触发方式()()()
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