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【单选题】
在冬季结冰期，应在墩台及破冰凌周围凿冰沟，实体墩台冰沟与墩台间距离可为（）。
A.
0.2～5m
B.
0.5～5m
C.
1.2～5m
D.
2.5～5m
参考答案：
参考解析：
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举一反三
【单选题】Passage Two New ice core samples taken from the centre of the Greenland ice-sheet have given a detailed record of the last "interglacial(间冰期)" which ran from about 135,000 to 115,000 yea...
A.
there is an unseen hand controlling the earth’s movement
B.
there is an operating manual warning people against air-conditioning in the factory
C.
people should prepare operating manuals to tell workers how to get greater comfort
D.
people have been enjoying the most comfortable climate in Earth’s history