未知题型
根据管道内物质的一般性能，下列关于工业管道识别色的说法错误的是（ ）。
- A.水是艳绿色
B.酸或碱是紫色
C.气体是中黄色
D.氧是大红色
【参考答案】
D
本题考核的是根据管道内物质的一般性能，基本识别色分为八类。例如：水是艳绿色，水蒸气是大红色，空气是淡灰色，气......
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未知题型
听力原文： The UN Security Council has unanimously adopted a resolution renewing the UN peace-keeping force in Rwanda for another 6 months while reducing its size by more than half. (26[C]) The UN resolution authorizes the reduction of the UN assistance mission in Rwanda (25[A]) from 5000 troops to 2300 troops within three months and to 1800 troops within four months. The resolution is a compromise between a proposal by UN Secretary General to cut the UN force in half and Rwandans' wish for an even larger reduction. Rwandan authorities say they have assumed responsibility for national security following last year's Hutu-led genocide, reducing the need for UN peace-keeping. (26[B], [D]) The UN force will also help with the training of the national police force and with the delivery of humanitarian aid.The reduction of ______ UN peace-keeping troops within 4 months from Rwanda is authorized.A．5000B．2300C．3200D．1800
A.
The
B.
A．5000
B．2300
C．3200 -
未知题型
一般大吨位起重机较多采用（ ），对起重机站位处的地基的要求相对较低，但行走速度较慢，转移场地需要用平板拖车运输。
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单项选择题
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