题目内容

Babbage wished to build a mechanical engine because ______.

A. he was very disappointed at the mathematical tables available at the time
B. he wanted to be the first man to invent a computing machine
C. be intended to make the mathematical tables flawless
D. he thought he was doing a significant work

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A. 有一定的吸附力，而且可逆性大，即容易解吸
B. 再展开过程中，吸附剂不与欲分离物质和展开剂发生化学反应而改变性质
C. 结构均匀，有一定的机械强度，但纯度要求不高
D. 吸附剂的颗粒应具有一定的细度和较大的表面积