一种产品从设计、批量生产投入市场,到逐步不适应消费者需要,被新产品淘汰的过程,叫()。
A.项目周期
B.技术周期
C.产品周期
D.企业周期噩
参考答案:C
23.— What’s that terrible noise.David?
— Oh,I forgot to tell you.The new machines in the nearby plant _______.
A.were tested
B.will be tested
C.are being tested
D.have been tested
肺血循环增多,而左心室和体循环血流减少的疾病是法洛四联症。()