单项选择题
改变磁通的人为机械特性曲线斜率（ ）
A、增大
B、减小
C、周期变化
D、不变
改变磁通的人为机械特性曲线斜率（ ）
A、增大
B、减小
C、周期变化
D、不变
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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
（ ）