当主电源发生故障时,临时应急电源应能自动供电()。
A.15mm
B.30mm
C.45mm
参考答案:B
阅读短文,回答词题。
It's September first today. It's a sunny day. Lucy rides her new bike to
school in the morning. She eats noodles for lunch at school. Now she is
playing with her skipping rope on the playground. She is very happy.
1. What's tlie date today?
________________________
2. How's the weathert?
3. Flow does Lucy go to school?
4. What's Lucy doing on the playground?
5. Is Lucy happy?
.阅读材料,回答问题。
“长三角”是“长三角都市经济圈”的简称,是指镇江以东,包括上海、苏州、无锡、南京、南通、杭州、宁波等在内的15个城市。该地区约占全国面积的1%,人口的6%,但生产总值却占全国的19.5%。成为继纽约经济圈、北美五大湖经济圈、东京经济圈、巴黎经济圈、伦敦经济圈之后的第六大经济圈,是名副其实的中国经济引擎。
(1)图中字母所代表的城市分别是A:__________,B:________,C:__________。
(2)我国长江三角洲、美国五大湖地区、日本东京地区、德国中部及英国中部五大城市群共同的社会经济区位因素是_____________________________________________。
(3)分析长三角城市群崛起的自然区位因素。(不少于四点)
_________________________________________________________________
(4)有人说:“上海港既是河港,又是海港”,你认为他说得有根据吗?