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问题 单项选择题

中枢神经系统白血病最多见于（）

A.儿童急性粒细胞白血病

B.急性淋巴细胞白血病

C.急性单核细胞白血病

D.慢性粒细胞白血病急变

E.慢性淋巴细胞白血病

答案

参考答案：B

解答题

生物圈的范围包括______、______和______．一切陆生生物的立足点是______．
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单项选择题

A socket is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running oncomputers attached to the network. A sockettwo addresses:. Sockets provide acommunication channel between one or more systems.
There aresockets separately using TCP and UDP.

A．unique

B．separate

C．same

D．dependent
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