脑梗死的表现()
A.病灶区rCBF增高
B.病灶区rCBF减低
C.普通脑显像见异常减低区
D.普通脑显像出现“新月”征
E.普通脑显像见弥漫性放射性增加
参考答案:B
Since he was 67, it didn't seem ________ that he would continue long in that position.[ ]
A.impossible
B.necessary
C.particular
D.likely
燃油锅炉正常停炉时,应先()。
A、停油泵
B、停风机
C、关主汽阀
D、减弱燃烧