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问题 单项选择题

舱（室）内拟装一般冷冻货物，其温度应达到如下规定的技术要求（）

A.舱温为－18℃以下

B.舱温为－2℃至＋4℃

C.舱温为－8℃至＋4℃

D.舱温为＋0.5℃至＋12℃

答案

参考答案：A

单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

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 (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.

3（）

A．collision

B．congestion

C．drop

D．delay
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问答题 简答题

如何提高醚化装置催化剂的使用寿命？
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