已知x+3y-2=0,则3x+27y+1的最小值是( ) A.339 B.1+22C

题型:选择题

问题:

已知x+3y-2=0,则3x+27y+1的最小值是(  )
A.3
39
B.1+2
2
C.6D.7
考点:基本不等式及其应用
题型:选择题

山药、黄精均可治脾胃虚弱证,是取其共同功效()

A.养脾阴

B.燥脾湿

C.益胃生津

D.补脾气

E.健脾止泻

题型:选择题

Some students think it d__小题1:___ to learn English well. That’s b__小题2:__ they don’t find the right way. I think r__小题3:___ is very important for students. The more you read, the b__小题4:__ you’ll understand. Reading is helpful to listening, speaking and writing.

If you often read English aloud, you’ll improve(提高) your listening. On the other hand(另一方面), listening a lot can h__小题5:____ you to read better. Reading English everywhere when you are f_小题6:__, if you wish. You can get a lot of knowledge(知识) when you read. Sometimes you need to s_小题7:__ your ideas, you can either speak or write. That means you are using w__小题8:__ you learned from reading. The same as Chinese, the more you read, the better you can write. If you want to r__小题9:__ something, you should read again and again. So from now on, you’d better do more reading. It’s a good w__小题10:__ to learn English well.

题型:选择题

工业用盐酸常因含杂质()而显黄色。

题型:选择题

泡沫灭火器在使用时,应()。

A、拉出插销

B、对准火源按下压把

C、防止冻伤

D、将灭火器倾斜过来

题型:选择题

转向桥主要的功用是承受地面和车架之间的()、纵向力和横向力,并保证转向轮作正确的运动。

A、垂直载荷

B、运动载荷

C、加速载荷

D、冲击载荷

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