轻便铁铤用圆形钢杆制成，一端为环状，作为把手，另一端为四棱锥尖型，铤重约为()。
A. 4公斤
B. 5公斤
C. 6公斤
D. 7公斤
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Which of the following is NOT mentioned as an obstacle of humanitarian assistance in Somalia？
A. Security challenge.
B. Distance challenge.
C. Operational challenge.
D. Funding challenge.
自动扶梯是()依靠作为运行的动力？
A. 电动机
B. 发电机
C. 稳压泵
D. 备用泵
What is the news item mainly about？
Africa"s passion for radio.
B. The number of radio stations in Kenya.
C. The rapid spread of new technology in Africa.
D. Ways to receive news and entertainment in Africa.
洋务运动客观上对中国早期工业和民族资本主义的发展起了某些促进作用。
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