Jim was a fast swimmer and soon swam the others.
A.ahead
B.ahead of
C.front
D.in front
答案:B
对可锻铸铁描述正确的是()
A、可铸造
B、石墨团絮状
C、强度比灰铁低
D、退火时间短
办案人员的态度会对鉴定结论产生影响。