提升传动系统的组成及动力传递路线?
参考答案:
组成:联轴器、减速机、卷筒、钢丝绳及Ⅰ、Ⅲ轴。
动力传递:由电动机→联轴器→Ⅰ轴→人字齿减速机→Ⅱ轴→直齿减速机→Ⅲ轴→卷筒。
Tom: My brother will be surprised when he opens this package I’m sending.
Jack: Why are you sending him a package?
Tom: __________.
A.It’s a new radio
B.It’s his birthday
C.It’s very expensive
D.It’s too late
超声检查,睾丸内见小的类圆形无回声暗区()
A.精原细胞瘤
B.畸胎瘤
C.胚胎瘤
D.睾丸囊肿
E.鞘膜积液