What has happened to DOE's "Solar Village on the National Mall"？
A. It has revealed a mechanical problem.
B. It lacks the energy for operation.
C. It needs substantial financial support.
D. It has drawn criticism from the government.
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矿山安全技术
本部分共10小题，每小题1分。每题的备选项中只有一个最符合题意。
井下电网采区电气设备使用()供电时，必须制定专门的安全措施。
A. 1140V
B. 127V
C. 3300V
D. 10000V
What does the author say about the weather？
A. It is rare for Washington,D.C.to have such long rainy days.
B. It has been raining since Sept 26th for the most of the time.
C. It is favorable to the manufacturers to promote solar equipment.
D. It has helped see the disadvantages of solar energy.
A．A report.B．A magazine.C．A text book.D．A science book.
A report.
B. A magazine.
C. A text book.
D. A science book.
比较单一价格垄断和完全竞争可知，消费者所损失的全部消费者剩余都被垄断者获取。
A. 正确
B. 错误
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