简述乙醇的鉴定。

.同时掷两个骰子，点数之和等于5的概率是       

补全对话，每空一词。

G1: Hi! Welcome to our English club. Today we're going to talk about the   1   ways to learn English.

Who has a good idea?

B1: Do you learn English   2       3   English-language videos?  .

G2: No, it's too hard to understand the   4  .

B1: What about   5   a diary in English? Do you learn English that way?

G2: I think so. It helps to write English every day.

G3: Have you ever    6   with a group?

G2: Yes, of course! I've learned a lot that way.

G1: Do you ever practice   7   with friends?

G2: Oh, yes. It   8   my speaking skills.

B1: What about reading aloud to practice    9   ?

G3: I do that sometimes. I think it is very helpful.

B2: I do, too. And I always look up the new words in a   10   .

G3: That's a great idea.

1.           2            3.           4.           5.          

6.           7.           8.           9.           10.          

三相异步电动机瞬间，因转子还是静止的，故此时转子中的感应电流为零。（）

下图为生态系统中能量流动图解部分示意图，①②③④各代表一定的能量值，下列各项中不正确的是（）

A.生物与生物之间吃与被吃的关系不可逆转，所以能量流动具单向性

B.一般情况下，②为①的10％～20％

C.①表示流经生态系统内部的总能量

D.从能量关系看②＞③＋④

切粒水流量低的处理措施不正确的是（）。

A、检查系统有无漏点，不做处理

B、若为泵故障首先切换到备用泵，联系三修处理故障泵

C、检查水分配器、喷头若堵塞立即清理

D、切换到备用换热器