【单选题】板桥的特点
A.
建筑高度小、构造简单、施工方便,采用预制装配施工时,预制构件重量小、架设方便。
C.
建筑高度大、构造复杂、施工不便,采用预制装配施工时,预制构件重量小、架设方便。
【单选题】下列有关说法正确的是( )
A.
淀粉、蛋白质、油脂都是营养物质,都属于高分子化合物
【单选题】下列说法正确的是( )
A.
蛋白质属于天然高分子化合物,组成元素只有C、H、O、N
B.
用浓Na 2 SO 4 、CuSO 4 溶液或浓HNO 3 溶液使蛋清液发生盐析,进而分离、提纯蛋白质
C.
蛋白酶是蛋白质,它不仅可以催化蛋白质的水解反应,还可以催化淀粉的水解反应
D.
甘氨酸(H 2 N-CH 2 -COOH)既有酸性,又有碱性,是最简单的氨基酸
【单选题】下列说法正确的是( )
A.
蛋白质属于天然高分子化合物,组成元素只有C、H、O、N
B.
用浓Na 2 SO 4 或浓HNO 3 溶液使鸡蛋清发生盐析,进而分离、提纯蛋白质
C.
蛋白酶是蛋白质,它不仅可以催化蛋白质的水解反应,还可以催化淀粉的水解反应
D.
甘氨酸(H 2 N—CH 2 —COOH)既有酸性,又有碱性,是最简单的氨基酸
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【简答题】整体式简支板桥与装配式正交实心板桥的特点与适用如何?
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