Oil Holds Above \$46 Supply Worries Linger &lt;p&gt;\&lt;/p&gt;&lt;p&gt; By Toby Reynolds&lt;/p&gt;&lt;p&gt; LONDON (Reuters) - Oil prices held firm on Tuesday as China\showed no let-up in its strong import growth and U.S. Gulf\producers reported damage to offshore rigs from Hurricane Ivan.&lt;/p&gt;