选出下列单词中不同属性的一项（  ）

已知函数$f\left(x\right)=\left\{\begin{array}{c}2-{\left(\frac{1}{3}\right)}^x,x\le 0\\ \frac{1}{2}{x}^2-x+1,x>0\end{array}\right.$．

（1）请在直角坐标系中画出函数f（x）的图象，并写出该函数的单调区间；

（2）若函数g（x）=f（x）﹣m恰有3个不同零点，求实数m的取值范围．

一根电缆埋藏在一堵南北走向的墙里，在墙的西侧处，当放一指南针时，其指向刚好比原来旋转180°，由此可以断定，这根电缆中电流的方向为                                    

一匀强电场，场强方向水平，一个质量为 $m$ ，带正电最为 $q$ 的小球，从 $O$ 点出发，初速度的大小为 $v_0$ ，在电场力与重力的作用下，恰能沿与场强的反方向成 $\theta$ 角做直线运动．求：

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    My mother is a doctor.She is unable to get back home 1 every day.And she has to work on weekends sometimes.So it's hard for her to do all the 2 after work.
    As a member of the family，I think it's my duty to 3 some housework.4Mom always says she doesn't need any help，there are always things I can do.5 ， I can help do the dishes and set the table.I'm sure Mom loves me 6 to help her.
    What's more，I'm trying to be 7.I wash my own clothes，tidy up my bedroom and take care 8 my things.I'm old enough to do these things.And I can't9 on my parents forever.
    Always show your 10 to your mom for everything she does.I believe she will feel sweet.Try it now.