计算题：已知单杆液压缸缸筒直径D=100mm，活塞杆直径d=50mm，工作压力p1=

阅读理解。

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麦当劳的经营方式是什么？（）。

A、区域连锁经营

B、全球化的特许经营

在设备调平找正的质量控制中，一般情况下，对于（）的设备，测点数可较小。

A、刚性较小

B、刚性较大

C、易变形

D、不易变形

美国历史学家斯塔夫里阿诺斯指出：“正如整个世界感受史蒂芬孙的机车、富尔顿的汽船和加特林的机枪的影响一样，它也感受到《独立宣言》、《 * * 和公民权宣言》和《 * * 党宣言》的影响。”斯塔夫里?阿诺斯在这里说明的是 [ ]

A．世界各地的横向联系进一步加强

B．工业革命对历史发展有重大影响

C．美国革命和法国大革命影响深远

D．科技革命对社会的影响越来越大

在我国，关于期货价格的正确说法是( )。

A．集合竞价未产生成交价格的，以集合竞价后第一笔成交价为开盘价

B．收盘价是某一期货合约当日交易后最后一笔成交价格

C．最新价是某一期货合约在当日交易期间的即时成交价格

D．当日结算价的计算无需考虑成交量