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【单选题】
The specific DNA sequences to which the transcription factors bind are referred to as _____A.
replication elements
B.
blocking factors
C.
transcription factors
D.
regulatory elements
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【单选题】（ ）The reason why the electric eel is able to give more powedul shock is that．
A.
compared with those in the torped0，the working system of electric plates in theeel is moreDirect and efficient
B.
compared with other electric fish，the eel possesses much more electricDlates
C.
the working system of the electric plates in the eel is far inferior to those in thetorpedo
D.
the working system of the electric plates in the eel is the most effective
【单选题】What is the most important reason that Sequoyah will be remembered?
A.
California redwoods were named in his honor.
B.
He was illiterate.
C.
He created a unique alphabet.
D.
He recovered from his madness and helped mankind.
【简答题】场景 某电气安装工程公司承包某化工厂电气设备安装工程。该设备主要有能量转换设备、开关设备以及防雷设备。设备安装完毕，经检查，无质量问题。但该化工厂在正常运营一段时间后发生爆炸事故，经调查，属于内部过电压造成，于是化工厂立即采取有效措施，防止事故再次发生。 根据场景，回答下列 20～24 问题： 第 20 题 布线系统指的是以（ ）为主的电缆、电缆及桥架、线槽和导管等。
【单选题】某电气安装工程公司承包某化工厂电气设备安装工程。该设备主要有能量转换设备、开关设备以及防雷设备。设备安装完毕，经检查，无质量问题。但该化工厂在正常运营一段时间后发生爆炸事故，经调查，属于内部过电压造成，于是化工厂立即采取有效措施，防止事故再次发生。 布线系统指的是以( )为主的电缆、电缆及桥架、线槽和导管等。
A.
380V/220V
B.
360V/240V
C.
340V/220V
D.
380V/240V
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