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【单选题】
下列关于真核生物中基因、染色体和性状的叙述,错误的是A.
基因是有遗传效应的DNA片段
B.
染色体的主要成分是RNA和蛋白质
C.
染色体是基因的主要载体
D.
生物体性状的表现受环境影响
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举一反三
【单选题】A vessel engaged in minesweeping on the high seas carries which of the following day signals ?
A.
Two green balls in a vertical line
B.
Two black balls in a vertical line
C.
A black ball at the foretruck and yardarm ends
D.
A shape of two cones point to point
【单选题】The door and the windows were all closed and there was no _____ of forced entry. [ ]
A.
scene
B.
signal
C.
sign
D.
sight
【单选题】Scientists are sure that the color red ______.
A.
encourages athletes wearing it
B.
is a signal of vigor
C.
is superior to the color blue
D.
delivers messages of mental advantage TEXT C
【简答题】在图示的电路中,已知 C =0.1mF 。 开关 S 闭合后电路的时间常数 为( )s。
【单选题】Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access...
A.
Current development.
B.
Transmission of message.
C.
Computer networking.
D.
Government regulation.
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