$$ \begin{aligned} &\text { Using the data given below, the strongest reducing agent is: }\\ &\begin{array}{ll} \mathrm{E}_{\mathrm{Cr}_2 \mathrm{O}_7}^{\mathrm{o}}{ }^{2-} / \mathrm{Cr}^{3+}=1.33 \mathrm{~V} & \mathrm{E}_{\mathrm{MnO}_4^{-} / \mathrm{Mn}^{2+}}^{\mathrm{o}}=1.51 \mathrm{~V} \\ \mathrm{E}_{\mathrm{Cl}_2 / \mathrm{Cl}^{-}}^{\mathrm{O}}=1.36 \mathrm{~V} & \mathrm{E}_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\mathrm{O}}=-0.74 \mathrm{~V} \end{array} \end{aligned} $$
$ Cr$
$\mathrm{Mn}^{2+}$
$\mathrm{Cr}^{3+}$
$\mathrm{Cl}^{-}$
$$ \text { The degree of the differential equation } \sqrt{1+\left(\frac{d y}{d x}\right)^{1 / 3}}=\frac{d^2 y}{d x^2} \text { is: } $$
6
3
1
2
If $f(x)=x^3+\frac{3}{2} x^2+3 x+3$, then $f(x)$ is
Even function
Decreasing function
Increasing function
Odd function
Let point Q be the image of point $P(2,-1)$ in the line $3 x+5=4 y$.
Find the area of the circle that has the segment PQ as the diameter.
$9 \pi$
$36 \pi$
$1.96 \pi$
$3 \pi$
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