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【单选题】
下面对 摆动气缸说法不正确的是：（ ）A.
摆动气缸是出力轴被限制在某个角度内做往复摆动的一种气缸，又称为旋转气缸。
B.
摆动气缸目前在工业上应用广泛， 多用于安装位置受到限制或转动角度小于360°的回转工作部件，其动作原理也是将压缩空气的压力能转变为机械能。
C.
常用的摆动气缸的最大摆动角度分为90°、180°、360°三种规格。
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举一反三
【单选题】Which of the following proteins involved in cotranslational translocation of proteins into the ER membrane is not a GTP-hydrolyzing protein?
A.
a subunit of the SRP receptor
B.
elongation factors in ribosome mediated mRNA translation
C.
P54 subunit of SRP
D.
Sec61 translocon
【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】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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