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【简答题】
Read the text and answer the questions below. A walk through the woods. I live in a very old town which is surrounded by beautiful woods. It’s a famous beauty spot . On Sundays, hundreds of people come from the city to see our town and to walk through the woods. Visitors have been asked to keep the woods clean and tidy. Litter baskets have been placed under the trees, but people still throw their rubbish everywhere. Last Wednesday, I went for a walk in the woods. What I saw made me very sad. I counted seven old cars and three old refrigerators. The litter baskets were empty and the ground was covered with pieces of paper, cigarette ends, old tyres, empty bottles and rusty tins. Among the rubbish, I found a sign which said, ‘Anyone who leaves litter in these woods will be prosecuted.’ What does the underlined word a famous beauty spot most probably mean in the 2nd sentence?
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【单选题】特低电压限值是指在任何条件下,任意两导体之间出现的()电压值。
A.
最小
B.
最大
C.
中间
【单选题】特低电压限值是指在()条件下,任意导体之间或任一导体与地之间允许出现的最大电压值。
A.
正常运行
B.
故障
C.
空载
D.
任何
【判断题】扫频仪应放在阳光充足的地方避免受潮。( )
A.
正确
B.
错误
【判断题】特低电压限值决定于人体允许的电流和人体阻抗。()
A.
正确
B.
错误
【判断题】特低电压限值是指任意导体之间或任一导体与地之间允许出现的最大电流值。()
A.
正确
B.
错误
【单选题】图示两种构架中,横杆均视为刚性,各竖杆的横截面和长度均相同,材料均为 A3 钢。设 P 和 P' 分别表示这两种构架的最大许可荷载,则下列结论中哪些是正确的 ? (1) P>P’ ; (2) P (3) P 值完全取决于杆 EF 的稳定性; (4) P’ 值完全取决于杆 C’D’ 的稳定性。
A.
(1) 、 (3)
B.
(2) 、 (4)
C.
(1) 、 (4)
D.
(2) 、 (3)
【判断题】特低电压限值是指任意导体之间或任:-导体与地之间允许出现的最大电流值。( )
A.
正确
B.
错误
【简答题】特低电压限值是指在( )条件下,任意导体之间或任意导体与地面之间允许下出现的最大电压值。
【单选题】采用特低电压限值的电路一端能否接地?
A.
必须接地
B.
严禁接地
C.
可接地或不接地
D.
需要串联电阻接地
【判断题】中国党政体制改革的第二阶段,中国政府由“权威政府”转向“执政政府”。
A.
正确
B.
错误
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