软件维护工作越来越受到重视,因为它的花费常常要占软件生命周期全部花费的 ( )左右。
A.10%~20%
B.20%~40%
C.60%~80%
D.90%以上
参考答案:C
读一读,判断句子的正误,对的打“√”,错的打“×”。
( ) 1. One day, a tiger sleeps in a river.
( ) 2. A monkey likes to eat meat for breakfast.
( ) 3. A lion lives in the forest.
( ) 4. Camels can fly.
( ) 5. A bird lives in a tree.
( ) 6. A panda lives in a hole.
( ) 7. A zebra has a pouch.
“所有权虽受他物权的限制,但他物权一旦消灭,所有权即恢复其圆满状态”表述的是所有权的( )。
A.完整性 B.本源性 C.弹力性 D.社会性