【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
【单选题】在按照汽车ABS的系统控制方案划分,汽车ABS有()。
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
【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?
B.
45,XX,der(14;21)(q10;q10)
【多选题】下列会计科目中,属于成本类的会计科目有 ( ) 。
【单选题】The simplest form of ABS is the ______.
【判断题】轴类工件外圆径向探伤时,曲底面回波声压比同声程理想大平面相同.( )