腺周口疮的损害特点是()
A.溃疡数量多而深
B.溃疡为圆形散在分布
C.单个溃疡,基底硬结
D.单个溃疡深而大
E.口腔溃疡常伴生殖器损害
参考答案:D
根据企业所得税税收优惠政策,国家确定的贫困地区新办的企业,可在( )内减征或者免征所得税。
A.1
B.2
C.3
D.5
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Families in big cities have ()children than they did thirty years ago.