$7)1\mathrm{.}0$ micrometer equals how many millimeters?A$)1\mathrm{.}0\backslash$times $10-3$B$)1\mathrm{.}0\backslash$times $10-6$C$)1\mathrm{.}0\backslash$times $106$D$)1\mathrm{.}0\backslash$times