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【多选题】
关于公路工程中使用的水泥，对其化学性质和物理性质有较高的要求，属于水泥一般要求的有（ ）。A.
抗压强度符合国家标准
B.
三氧化硫含量不得超过3%
C.
氧化镁含量不得超过5%
D.
抗折强度要符合行业标准
E.
抗冻强度符合国家标准
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举一反三
【单选题】What is the author's opinion of geothermal energy?
A.
Geothermal energy has some disadvantages, but it is probably going to be used in the future.
B.
Geothermal energy is a source that should be explored further before large-scale production begins.
C.
Geothermal energy offers an opportunity to supply a significant amount of power in the future.
D.
Geothermal energy should replace water power in the production of electricity for the United States.