逐渐视力下降无眼痛()
A.急性闭角型青光眼
B.弱视
C.缺血性视神经病变
D.开角型青光眼
E.以上均不是
参考答案:D
— ________ David and Vicky ________ married?
— For about three years.
A.How long were; being
B.How long have; got
C.How long have; been
D.How long did; get
燃油锅炉的燃料输送系统一般由()组成。
A.提升机、油罐、油泵等
B.日用油箱、油泵、油罐,油流动驱动设备等
C.油罐、油泵、油管、过滤器、日用油箱等
D.油罐、过滤器、提升机、油泵等