单项选择题

指令寄存器的位数取决于（）。

A．存储字长
B．存储器容量
C．机器字长
D．指令字长

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多项选择题

________ are facts about Hessians. （） A. All of them came from the German state of Hesse-Cassel B. They made up about 1/4of the British fighting force in America. C. They had limited military experience D. They were mercenaries

单项选择题

9. Chemical weathering involves the _____ of rock from exposure to water and atmospheric gases (principally carbon dioxide and water vapor).

A．fragment
B．decomposition
C．oxidation
D．towering