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【简答题】
指数函数y = ,当 时,函数是增函数;当 时,函数是减函数。
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反馈参考答案：
举一反三
【单选题】某城市空气质量较差,检测结果显示,在主要污染物中,PM 颗粒浓度严重超标,PM 颗粒浓度及有害气体浓度尚在正常范围。如果你是城市决策者,采取以下哪些措施能在影响最小的情况下,最有效地改善空气质量( )
A.
改郊区水泥厂 ②整改郊区造纸厂
B.
区车辆限号行驶 ④改善郊区植被环境
C.
①②
D.
①④
E.
③④
F.
②③
【单选题】Steve's parents promised to send him to college because of ________.
A.
the requirement of his biological mother
B.
their lifelong dream to graduate from college
C.
Steve's wish to learn more in a good college
D.
the adoption institution's basic rules
【单选题】下图的圈梁被窗洞口截断,请在其上方为其设计一道附加圈梁,并确定其尺寸:当附加圈梁的梁高取200时,该附加圈梁的总长度最小可以做到多长?
A.
3200
B.
4000
C.
4800
D.
5200
【简答题】Steve's parents split _____ when he was only four.
【简答题】Steve, a twelve-year-old boy with alcoholic parents, was about to be lost forever , by the U.S. education system. Remarkably, he could read, yet, in spite of his reading skills, Steve was failing. He ...
【简答题】Steve, a twelve-year-old boy with alcoholic parents, was about to be lost forever, by the U.S. education system. He had been failing since first grade. Steve was a big boy, looking more like a age...
【多选题】关于平面图形的分析与绘图,下列叙述正确的是()。
A.
平面图形的尺寸分为定形尺寸和定位尺寸两类
B.
具有完整的定形尺寸和定位尺寸，能够直接画出的线段称为已知线段
C.
连接线段既有定形尺寸又有定位尺寸
D.
平面图形中的线段分为已知线段，连接线段
【简答题】青岩教案是贵州历史上第()次教案。 答案填写中文,不能使用阿拉伯数字
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