荒煤气中含有焦油汽.氨.苯类。
参考答案:对
To enjoy a better future, you should ____________ difficulties when you are faced with them.
A.go over
B.get over
C.take over
D.turn over
突然视力下降伴有眼痛见于
A.视网膜脱离
B.急性闭角型青光眼
C.玻璃体出血
D.缺血性视神经病变
E.视网膜静脉阻塞