汽轮机汽缸螺栓加装锥面或球面变径垫圈的目的是（）。
A.补偿螺杆偏斜
B.补偿法兰面偏斜
C.补偿汽缸振动
D.消除附加的弯曲应力
参考答案：A
Which one of the following is incorrect for the biogenesis of eukaryotic ribosomes( )
A．25-50% of the pre-rRNA is degraded
B． Pre-rRNA binds to ribosomal protein
C． Pre-rRNA is cut to form three classes of rRNA
D．Pre-rRNA is methylated
E．The rRNA gene for the 40S subunit is transcribed separately
E花环法用于（）
A.T淋巴细胞计数
B.T淋巴细胞功能检测
C.B淋巴细胞计数
D.B淋巴细胞功能检测
E.T淋巴细胞亚群检测
