句型转换
be aware of, (be)scared to death, upside down, at close range, wake up, be fond of, get close to, in danger of
下列有关激素调节的叙述,正确的是( )
在△ABC中,D为BC中点,DE⊥AB于E,DF⊥AC于F,已知DE=DF,则下列结论不一定成立的是( )