问题
单项选择题
不同机组的检修周期差别较大，影响的因素很多。通常（）电站的检修周期较短。
A、高水头
B、水流中含泥沙量较多
C、低水头
D、引水式
答案
参考答案：C
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不同机组的检修周期差别较大，影响的因素很多。通常（）电站的检修周期较短。
A、高水头
B、水流中含泥沙量较多
C、低水头
D、引水式
参考答案：C
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| Do you know about Australia? Australia is 1 island in the world. It is a little 2 than China. It is 3 the south of the Earth. Australia is big, but its 4 is not large. It is nearly (几乎) as large as 5 of Shanghai. The climate 'there is comfortable. It is never very hot in summer 6 very cold in winter. The cities in Australia have little air or water pollution (污染). The sky is blue and the water is 7 . You can see the fish 8 in the rivers. The plants grow very well, Australia is famous for 9 kangaroo. Many visitors like to travel there to see them. Sheep is famous in Australia, 10 . On the low hill or grassland, you can find lots of white sheep. | ||||
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为（）。