Let $A$ and $B$ be subsets of a set $X$. Then

What is preserved in a museum?

Which logic gate is represented by the following combination of logic gates?

$A$ line $L$ has intercepts $a$ and $b$ on the coordinate axes. When the coordinate axes are rotated through an angle $\alpha$ keeping the origin fixed,the same line $L$ has intercepts $p$ and $q$ on the new axes. Then

What is the size of $Wolffia$ $globosa$?

If $\vec{P} \cdot \vec{Q} = PQ$,then the angle between $\vec{P}$ and $\vec{Q}$ is ............. $^\circ$.