荧光探伤检验零件前需适应黑暗的时间是()。
参考答案:3-5min
He wrote his first novel ______ studying in a university.
A.since
B.as
C.while
D.with
肾挫伤的主要临床表现()。
A.大量肉眼血尿
B.显微镜下血尿或肉眼血尿
C.不易纠正的严重休克
D.腰部肿块和肉眼血尿
E.腰部肿块