水平接地汇集线上应预留连接孔,一般直径()。
A.3mm
B.5mm
C.8mm
D.10mm
参考答案:C
任务型阅读,给图片选择正确的句子。
1. _____ 2. _____ 3. _____ 4. _____ 5. _____
A. You can see there are lots of computers in the room..
B. Where is Beijing? It's near Tianjin..
C. My favourite food is chicken..
D. Don't talk in the library.
E. What colour is this flower?
下面关于经线特点的叙述,正确的是 [ ]
A、经线的长都不相等
B、所有的经线都经过极点
C、经线指示东西方向
D、所有的经线都是个圆圈