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问题 单项选择题

铁铝榴石特征吸收光谱为（）处有强吸收线。

A.500nm，510nm，520nm

B.513nm，534nm，557nm

C.504nm，520nm，573nm

D.524nm，540nm，573nm

答案

参考答案：C

单项选择题

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (61) between sending the notification and notification arriving at the source, thousands of additional (62) may arrive. In ATM network, a major tool for preventing (63) is (64) control. When a host wants a new virtual (65) , it must describe the traffic to be offered and the service expected.

A．collision

B．congestion

C．drop

D．delay
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单项选择题 A1/A2型题

支配肱三头肌的神经是（）。

A.桡神经

B.肌皮神经

C.腋神经

D.正中神经

E.尺神经
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