电气系统、给排水管理、设备安装的最低保修期限为( )年。
A.1B.2C.3D.5
参考答案:B
解析:在正常使用下,电气系统、给排水管道、设备安装的最低保修期为2年。
—How much did the book _____ you?
—I _____ about 20 yuan on it. [ ]
A. take, spent
B. spend, spent
C. cost, spent
D. cost, cost
青光眼的病理改变为()
A.视神经萎缩
B.晶状体混浊
C.视野缺损
D.病理性眼压升高
E.视网膜水肿