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【单选题】
某批混凝土经抽样，强度等级为C30，意味着该混凝土（ ）。A.
立方体抗压强度达到30 的保证率为95％
B.
立方体抗压强度的平均值达到30
C.
立方体抗压强度达到30 的保证率为5％
D.
立方体抗压强度设计值达到30 的保证率为95％
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【单选题】Although the human population around the forestland in Middlesex County has increased, the amount of forestland has not been reduced. Therefore, the decrease in the county s songbird population cannot...
A.
As the human population of Middlesex County has grown, there has been an increase in the number of shopping malls built.
B.
The presence of more garbage cans resulting from the increase in the county's human population ensures the survival of more raccoons, which prey on songbird eggs whenever available.
C.
There has recently been a decrease in the amount of rainforest land in Central and South America, where songbirds spend the winter months.
D.
Although several species of songbirds are disappearing from Middlesex County, these species are far from being endangered.
E.
The disappearance of songbirds, which eat insects, often results in increased destruction of trees by insects.
【单选题】Some students offered _______ money for the children without parents. A. raise B. raising C. raised D. to raise
A.
raise
B.
raising
C.
raised
D.
to raise
【简答题】Although April did not bring the rains we all hoped for, and although the Central Valley doesn’t generally experience the atmospheric (大气的) sound and lightning that can accompany those rains, it is st...
【简答题】设备的( )寿命，是指设备从投入使用开始，直到因物质磨损而不能继续使用，报废为止所经历的全部时间。 A自然寿命 B经济寿命 C技术寿命 D有效寿命
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