问答题
使航天器从一个自由飞行段轨道转移到另一个自由飞行段轨道的控制，称之为（）
使航天器从一个自由飞行段轨道转移到另一个自由飞行段轨道的控制，称之为（）
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单项选择题
Which one is correct about tumor suppressor genes? ()
Which one is correct about tumor suppressor genes? ()
A．Has the effect of inhibiting cell proliferation
B．Normally expressed in all tumor cells
C．Does not affect cell proliferation and differentiation after deletion
D．Not present in normal human cells
E．Not related to oncogene expression
（ ）