油浸式变压器（电抗器）精益化评价细则要求：事故油坑鹅卵石大小鹅卵石铺设满足厚度不小于（）mm。
A.210
B.220
C.230
D.250
参考答案：D
Though measures have now been taken to prevent further price hikes, many people remain _______ over the rising cost of food.
A．be concerning
B．concerns
C．concern
D．concerned
长沙有3家企业进入“全国成长性服务外包企业100强”，它们是？
