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【单选题】
如混凝土的强度等级为C30, 则下列哪项叙述正确A.
抗压强度设计值 fc=30MPa
B.
抗压强度标准值 fck=30MPa
C.
立方体抗压强度标准值 fcuk=30MPa
D.
抗拉强度标准值 f tk=30MPa
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A.
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B.
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C.
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D.
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E.
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【单选题】下面有关我国地理位置的叙述正确的是（ ）
A.
北回归线穿过我国中部
B.
我国位于亚洲东部、太平洋东岸
C.
我国位于东半球的西部
D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
Lack of nutrition in early children can cost developed nations up to three percent of their yearly earnings.
B.
Poor countries could possibly double their economic growth if they improved nutrition.
C.
Almost all the world economy was affected by the African malnutrition.
D.
Natonal economy is the base for individua's nutrition.
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