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【单选题】
以下关于广域网技术的叙述中,错误的是:A.
广域网技术研究的重点是核心交换技术
B.
广域网技术的典型技术包括公共交换网PSTN，综合业务数字网ISDN，数字数据网DDN，X.25分交 换网，X.25分组交换网，帧中继网，异步传输模式ATM网，光以太网等
C.
帧中继网是基于点-点连接的窄带公共数据网
D.
异步传输模式ATM网的发展空间已经比较小
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反馈参考答案：
举一反三
【单选题】Q1
A.
He possesses a large amount of money and material goods.
B.
He has the ability to purchase more goods.
C.
He is not able to spend all the money that he has in his lifetime.
D.
He tends to have an extravagant lifestyle.
【简答题】要从包涵体中分离出具有生物活性的产物,通常的处理步骤为:收集菌体细胞→细胞破碎→离心分离→“ ”→目标蛋白的变性溶解→“ ”。
【单选题】Q1
A.
He would find no food served on board.
B.
He could get home with enough food.
C.
He planned to eat nothing before he got home.
D.
He hoped a kind man could invite him to have a big meal.
【单选题】远期合约与期货合约的本质的区别在于( )。
A.
期货合约流动性强,远期合约流动性差
B.
期货合约在交易所交易
C.
期货合约是标准化合约,远期合约为买卖双方自行约定
D.
期货合约规定了产品的交易时间、价格等
【单选题】Q1
A.
He was shot on Friday.
B.
He was shot on Sunday.
C.
He was murdered on Friday.
D.
He was murdered on Sunday.
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