存储24×24点阵的一个汉字信息,需要的字节数是
A) 48 B) 72 C) 144 D) 192
参考答案:B
解析: 每8个点所存储空间等于1字节,所以24×24/8=72。
商事交易
待测粉末与氯仿共同振摇,过滤,保留提取过的粉末。()
A.Shake the powder being examined with chloroform, filter and reserve the extracted powder.
B.Shake the powder being examined with chloroform, filter and evaporate almost to dryness on a water bath.
C.Heat the powder being examined with a mixture of water and hydrochloric acid in a water bath.
D.Heat the powder being examined to boiling with a mixture of ethanol and water.
E.Shake the powder being examined with sulphuric acid, filter and wash the filter with sulphuric acid.