有的保温救生服前面设有一个带有弹簧开关的起吊环是为了便于直升机救助。（）
参考答案：对
— Obama won the election. It’s amazing!
— Yes. But the result was within ______ we had expected, ______ brought great joy to many young people and the black.
A．that; which
B．that; that
C．what; what
D．what; which
以下哪项引起的视神经萎缩属于继发性视神经萎缩
A．脉络膜视网膜炎
B．视网膜中央动脉栓塞
C．视网膜色素膜炎
D．视 * * 水肿
E．青光眼
