Edison had more than 1,000 inventions his lifetime. [ ]
A. among
B. at
C. during
D. on
答案:C
海关可以行使“径行开验”的权利,即必须在有见证人到场的情况下开拆货物,进行查验。 ( )
拉线安装时的技术要求有()。
A:拉线要求采用镀锌钢绞线,最小截面为25mm2
B:采用绑扎固定时,拉线两端设臵心形环,用直径不小于φ3.2mm的镀锌铁线绑扎固定
C:拉线与电杆的夹角一般为60°,受地形限制时,不应小于45°
D:居民区、厂矿内的拉线应装设拉线绝缘子