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【简答题】
接地体（线）为铜与铜或铜与钢的连接工艺采用热剂焊（放热焊接）时，其熔接接头必须符合哪些规定？
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举一反三
【单选题】Choose the correct description about earth.
A.
Earth burns and flares up
B.
Earth provides for sowing and reapng
C.
Earth moistens and descends
D.
Earth works towards transformation
【简答题】The Chicxulub crater in Mexico provides evidence that an asteroid hit Earth.
【单选题】The earth is the planet __provides us with everything we need, fresh air, clean water and so on. It ’s our duty to protect it .
A.
who
B.
that
C.
where
【简答题】The earth's biosphere (the suce layer of the planet and the surrounding atmosphere) provides the land, air, water, and energy necessary to sustain life. This life-support system is a complex, inter...
【单选题】What are the four things Earth provides to living things?
A.
air, food, water, and sunlight
B.
air, pets, toys, and shelter
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