综合布线系统分为下面6个子系统:建筑群子系统、主干(垂直)子系统、()(水平)子系统、()间子系统、管理子系统和工作区子系统。
参考答案:配线 设备
Of the nine fundamental principles of good language teaching and learning proposed by Palmer, ______ is the first and most important.
A. vocabulary build-up B. phonetic practiceC. habit formation D. grammar acquisition
日本血吸虫病通过接触疫水传播,发病有地区性和季节性特点,且与人群职业有关。