下列运算正确的是（ ） A．(-13)2=-13 B．-35+5=-25 C．36=±

三. 句型转换 ( 10分)

1. There are different ways of doing this.

There are ________________ ways of doing this.

2. He is more than my teacher; he is my friend.

He is ____________ _____________ my teacher; he is my friend.

3.They named their baby Tom, which is also the name of the baby’s grandfather.

The baby was _____________ ___________ his grandfather.

4. A large park has been built in our city; we are able to amuse ourselves after work.

The large park built in our city ____________ us __________ a place to enjoy ourselves.

5. I’ll do all I can to finish the work on time.

I’ll do ___________ __________ ____________ to finish the work on time.

心脏听诊时，主动脉瓣的关闭所引起的振动，标志心室舒张期开始的心音为（）。

A.第一心音

B.第二心音

C.第三心音

D.第四心音

E.连续性杂音

C521—1A型号是______车床。

A．普通卧式

B．单柱立式

C．数控

(A) 条件(1)充分，但条件(2)不充分；
(B) 条件(2)充分，但条件(1)不充分；
(C) 条件(1)和(2)单独不充分，但条件(1)和条件(2)联合起来充分；
(D) 条件(1)充分，条件(2)也充分；
(E) 条件(1)和条件(2)单独不充分，但条件(1)和条件(2)联合起来也不充分．

某产品由两道独立工序加工完成，则该产品是合格品的概率大于0.8．
(1)每道工序的合格率为0.81； (2)每道工序的合格率为0.9．

捞油井口有整体固定式、防撞脱式和高压式（）大类。

A、一

B、两

C、三

D、四