已知一个角的补角比这个角的4倍大15°,求这个角的余角.
设这个角为x,
由题意得:180°-x=4x+15°
解得:x=33,
∴余角为:90°-33°=57°.
抑制骨髓造血功能
A.青霉素B.氯霉素C.链霉素D.四环素E.红霉素
Woman: You’ve been doing weather reports for neatly 30 years. Has the weather got any worse in all these years Man: Well, not necessarily worse. But we are seeing more swings. Question: What does the man say about the weather
A. It’s worse than 30 years ago.B. It remains almost the same as before.C. There are more extremes in the weather.D. There has been a significant rise in temperature.