下列原因中，（）使得轴承过热。 A.填料压得太紧或填料函内没有冷却水 B.叶轮与泵壳

阅读理解。

     Tom is a tall boy. He is 178cm tall. He lives in America. On Sunday morning he likes to go to see his

friend. His name is Eric. He is a boy. He has a good garden (花园). There are (有) many trees and roses in

the garden. They are apple trees, orange trees and other (其他的) fruit trees. There are many fruits on the

trees. There are many birds in the garden, too. They are happy. The birds sing in the trees. Tom and Eric

listen to the birds and sing songs with (和┄┄ 一起) them. They draw pictures of birds.

      It's time for lunch. They are hungry. They go to a restaurant. Tom wants some dumplings. Eric would

like a bowl of noodles. After lunch, they go to see movies. They see an action movie. Its name is "Sharp

Shill".

1. Tom _____.

A. has a boy friend

B. is a short boy

C. lives in China

2. Here are many _____ in the garden.

A. flowers

B. cats and dogs

C. fruit trees and flowers

3. _____ sing in the tree.

A. Tom and Eric

B. Birds

C. Fruit

4. Tom and Eric _____.

A. don't like singing

B. don't like birds

C. like birds

5. They _____ after lunch.

A. go to swim

B. play soccer

C. go to movies

D. go home

如果长期接触该物质可发生的肿瘤是 ()

A．膀胱癌

B．皮肤癌

C．肝血管肉瘤

D．肺癌

E．白血病

测量油温时，油高3m以下，在油高（）一点测油温。

A、任意

B、底部

C、上部

D、中部

以下选项不是交接试验时的的典型安全控制措施是（）。

A.高压回路测量工作至少应两人进行

B.二次侧核相时，应防止二次短路或接地

C.高压回路测量时，用导线从钳型电流表另接表计测量

D.测量用的导线应使用相应电压等级的绝缘导线，其端部应有绝缘套

制作一个取样器，已知需用φ10³1不锈钢管100米，弯成中径100毫米，节距10毫米的一般弹簧形状，估算需盘多长的冷却蛇形管高度h？（精确到10毫米）