内燃机的万有特性
参考答案：
在一张图上较全面地表示内燃机各种性能参数的变化，应用多参数的特性曲线，称为万有特性。
—Why do English people talk so often about the weather when they start a conversation?
—Well, it’s probably because the weather is a(n)________ topic.
A．safe
B．sensitive
C．amazing
D．ordinary
共同共有
