拆卸变桨电机风扇所用工具为（）.
A.4mm内六方
B.5mm内六方
C.6mm内六方
D.8mm内六方
参考答案：B
兴奋性与抑制性突触后电位相同点是（）
A.突触后膜膜电位去极化
B.递质使后膜对某些离子通透性改变的结果
C.都可向远端不衰减传导
D.突触后膜膜电位超极化
E.都与后膜对Na+通透性降低有关
A healthy life is frequently thought to be ______ with the open countryside and homegrown food.[ ]
A. associated
B. bound
C. related
D. tied
