反映计算机速度的主要参数有运算速度和 【17】 。
参考答案：存取速度
计算：17-8÷（-2）+4×（-3）．
小题1:I want to travel, e______________to English-speaking countries.
小题2:Keeping p__________, such as dogs and cats is more and more popular among young and old.
小题3:Have you ever h_______________ of the interesting story?
小题4:Would you m_______________ turning down the music?
小题5:He has been c________________ stamps for five years.
