单项选择题

在简单碰撞理论中，有效碰撞的定义是： ( )
A、互撞分子的总动能超过Ec
B、互撞分子的相对总动能超过Ec
C、互撞分子的相对平动能在联心线上的分量超过Ec
D、互撞分子的内部动能超过Ec

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多项选择题

Which of the following descriptions are true about the trade on the Bay of Bengal?

A．Sri Lanka was once a gateway on the maritime trade route between Rome and China.
B．The Bay of Bengal is the mShipping through the Straits of Malacca was considered a safe voyage.aritime passage between Indian and Eastern Asia for the traders on the Silk Road.
C．Shipping through the Straits of Malacca was considered a safe voyage.
D．Cities overlooking the strait of Malacca became rich and powerful through trade and taxes on passing ships.

注塑机液压系统中有卸荷回路
正确
错误

答案：正确