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问题 计算题

(6分)在科学家眼里，二氧化碳是可以利用的重要资源。在一定条件下，二氧化碳和金属钠反应可以制金刚石CO2+4NaC (金刚石)+2Na2O

请计算92 g金属钠理论上可制得含碳96％的金刚石的质量。

答案

12.5g

解：设92g金属钠理论上可制得含碳96%的金刚石的质量为x，

CO2+4NaC (金刚石)+2Na2O

92         12

92g      96%•x

92：12=92g：96%•x

解得：x=12.5g

答：92g金属钠理论上可制得含碳96%的金刚石的质量为12.5g

单项选择题 A1/A2型题

外周血涂片经瑞氏染色后，胞核通常为不规则形、肾形、马蹄形或扭曲折叠的白细胞是（）

A.中性杆状核粒细胞

B.中性分叶核粒细胞

C.淋巴细胞

D.嗜酸性粒细胞

E.单核细胞
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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 (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.

1（）

A．interval

B．time

C．slot

D．delay
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