（）阀用来稳定系统液压和防系统过载。
参考答案：溢流
(2013·石家庄市高三二模)—I guess I must leave now. See you tomorrow.
—________！ I have some important information for you.
A．Hang on
B．Never mind
C．All right
D．Take care
鱼藤酮的作用机制是抑制昆虫体内（）
A、胆碱酯酶
B、线粒体
C、轴突
D、三羧酸循环
