听力原文:M: Excuse me, but could you tell me how to get to the railway station?
W: Yes, you'll have to take a No. 45 bus.
M: Does the bus take me straight to the station?
W: Yes, when you get off the bus, you will find the station just in front of you.
M: Good, but where is the bus stop?
W: Go straight along the road and turn right at the first crossing. You can't miss it.
M: Thank you. How soon can I get there?
W: Well, if the streets are not too crowded, you will get there in about half an hour.
M: Thank you very much.
W: You are welcome.
How can the man get to the railway station?
A.Take a No. 45 bus.
B.Take a No. 35 bus.
C.Take a No. 15 bus.
第1题
下列化合物中,酸性最强的是
A.α-羟基蒽醌
B.1,5-二羟基葸醌
C.2,6-二羟基葸醌
D.α-羟基蒽
E.1,2-二羟基蒽醌
第2题
下列化合物中,酸性最强的是
A.α-羟基葸醌
B.1,5-二羟基葸醌
C.2,6-二羟基葸醌
D.α-羟基蒽
E.1,2-二羟基葸醌
第3题
下列化合物中,酸性最强的是;
A.α-羟基蒽醌
B.1,5-二羟基蒽醌
C.2,6-二羟基蒽醌
D.β-羟基蒽醌
E.1,2-二羟基蒽醌
第4题
下列化合物中,酸性最强的是
A.α-羟基蒽醌
B.1,5-羟基蒽醌
C.2,6-二羟基蒽醌
D.α-羟基蒽
E.1,2-二羟基蒽醌
第5题
下列酸性最强的蒽醌类是
A.1,6-二羟基蒽醌
B.1,4-二羟基蒽醌
C.2,7-二羟基蒽醌
D.1,8-二羟基蒽醌
E.1,2-二羟基蒽醌
第7题
酸性最弱的是
A.2-羟基蒽醌
B.1,5-二羟基葸醌
C.1,2-二羟基蒽醌
D.1,8-二羟基葸醌
E.大黄酸
第8题
羟基蒽醌中,酸性最强的是
A、1-羟基葸醌
B、2-羟基蒽醌
C、1,2-二羟基葸醌
D、1,8-二羟基蒽醌
E、3,6-二羟基蒽醌
第9题
A.2-羟基蒽醌>1,8-二羟基蒽醌>1,4-二羟基蒽醌>5-羟基蒽醌
B.1,8-二羟基蒽醌>2-羟基蒽醌>1,4-二羟基蒽醌>5-羟基蒽醌
C.2-羟基蒽醌>5-羟基蒽醌>1,8-二羟基蒽醌>1,4-二羟基蒽醌
D.1,8-二羟基蒽醌>1,4-二羟基蒽醌>5-羟基蒽醌>2-羟基蒽醌
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