耐热铸铁大多为单相铁素体基体的()
A.灰口铸铁
B.可锻铸铁
C.球墨铸铁
D.蠕墨铸铁
参考答案:C
葡萄球菌肺炎
A.瘀点B.充血性皮疹C.瘀斑D.血肿E.小红痣
Jack asked John ______ when he met him in the street.
A.he was going where
B.where he was going
C.where was he going
D.was he going where