下列哪种病变不属于癌前期病变
A.肠道腺瘤样息肉B.胆囊胆固醇息肉C.慢性萎缩性胃炎D.粘膜白斑E.乳腺囊性增生症伴上皮增生
参考答案:B
Our usual walk is to or from the subway, ______ is how we get to work.
A.which
B.where
C.as
D.that
麻绳、棕绳作用捆绑绳和潮湿状态下使用时,其允许拉力应减半计算。