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【简答题】
方向阀主要用以实现()、()或()。
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举一反三
【单选题】在按照汽车ABS的系统控制方案划分，汽车ABS有（）。
A.
轴控式ABS、轮控式ABS和混合式ABS
B.
以车轮角减速度为控制的参数的ABS和以车轮滑移率为控制参数的ABS
C.
单通道式ABS和双通道式ABS
D.
四通道式ABS和三通道式ABS
【单选题】Translocations cause some of the most recognized genetic syndromes in human offspring. A translocation can be best described by which one of the following?
A.
They always produce cancer.
B.
They always produce mental retardation.
C.
They have to involve the exchange of an entire chromosome.
D.
They can only occur in the presence of reverse transcriptase.
E.
They can occur in somatic or stem cells.
【单选题】Which of the following is the Robertsonian translocation karyotype in Down syndrome?
A.
47,XX( or XY),+21
B.
45，XX，der（14；21）（q10；q10）
C.
46,XX
D.
46, XY
E.
47,XX(or XY),+18
【单选题】Which of the following statements regarding the mechanism of transformation in Bacillus subtilis is false?
A.
A competent bacteria contains a DNA receptor/translocation complex
B.
While translocation of exogenous DNA, both strands gets passage into the cell
C.
While translocation of exogenous DNA, only one strand gets passage into the cell
D.
The exogenous DNA recombines and incorporates itself in the chromosome of the recipient cell.
【单选题】Approximately _____ of the gametes produced by an individual heterozygous for a translocation will be nonviable.
A.
all
B.
half
C.
none
D.
a quarter
E.
an eighth
【单选题】The simplest form of ABS is the ______.
A.
single track ABS
B.
double track ABS
C.
automatic ABS
D.
moblie ABS
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