【多选题】镰刀形贫血叙述正确的是:
A.
遗传基因突变导致血红蛋白分子中氨基酸残基改变的分子病
C.
血红蛋白空间结构异常,形成螺旋形多聚体,使红细胞扭曲成镰状细胞(镰变)
D.
临床表现为慢性溶血性贫血、易感染和再发性疼痛危象以致慢性局部缺血导致器官组织损害。
【单选题】—Mum, I'm sorry I ______ my English test again, though I tried my best. —Oh, believe in yourself and you'll make progress at last. [ ]
【单选题】I couldn't believe my______when I saw the address and the name.
【单选题】I don't ________ ghosts but I do ________ my eyes -- I saw it with my own eyes.
【单选题】如图所示,当容器中装有密度为ρ的液体时,则下面表示A点所受压强的公式中正确的是: [ ]
【简答题】I’m a pig, and my son is a rabbit. I have snakes for daughters, and my wife, believe it or not, is a dragon! Do I live in a zoo? No, of course not! I am talking about Chinese zodiac signs(十二生肖). Depen...
【单选题】在如图所示的停车情况记录表中,若要根据停车价目表求出表中的单价,在C2单元格应输入的公式是( )
A.
=HLOOKUP(B9,$A$2:$C$3,2)
B.
=HLOOKUP(B9,$A$2:$C$3,2,FALSE)
C.
=VLOOKUP(B9,$A$2:$C$3,2)
D.
=VLOOKUP(B9,$A$2:$C$3,2,FALSE)
【简答题】先写出如图所示图形面积计算公式(用字母表示).并根据图中所示用转化的数学思想简要的写出该公式的导出过程. (1)S 1 =______S 2 =______S 3 =______ (2)平行四边形的底相当于长方形的(长),平行四边形的高相当于长方形的______;所以平行四边形的面积等于______的面积. (3)三角形的底相当于平行四边形的______,三角形的高相当于的平行四边形的______...