西藏自治区两会期间，记者从人力资源和社会保障厅了解到2017

西藏自治区"两会"期间，记者从人力资源和社会保障厅了解到2017年全区城镇新增就业54600人，将54600用科学记数法表示为 $($ 　　 $)$

A．

$5.46 \times 10^{2}$

B．

$5.46 \times 10^{3}$

C．

$5.46 \times 10^{4}$

D．

$5.46 \times 10^{5}$

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