消化性溃疡发生癌变的表现()。
A.消化不良症状加重
B.疼痛失去原有规律性
C.大便隐血试验持续阳性
D.胃酸分泌增多
E.进行性消瘦
参考答案:A, B, C, E
A projeet team budgeted US $3,000 for the work performed and has spent US $4,000 to date. If they budgeted US $5, 000 for the work scheduled, what is the cost variance
A) $-1,000.B) $2,000.C) $1,000.D) $-2,000.
简述误码秒、严重误码秒、误块秒、严重误块秒意义。