发动机拉缸抱瓦多和大修有关。

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问题:

发动机拉缸抱瓦多和大修有关。

考点:机械工程润滑油知识润滑油知识题库
题型:判断题

将1到1989的自然数从头开始,依次每四个数一组,第一组各数间添上“+”号,第二组各数间添上“一”号,以后各组以“+”,“一”号相间隔,列成一个算式:

1+2+3+4-5-6-7-8+9+10+11+12-13-….问:

(1)1989前添什么号?

(2)求这个算式的结果.

题型:判断题

用水泥砂浆砌筑的砌体,其抗压强度较用水泥石灰砂浆砌筑砌体抗压强度( )。

A.(A) 低

B.(B) 高

C.(C) 不一定

D.(D) 相等

题型:判断题

One day Jack’s wife was cleaning out a closet(壁橱).

"Look at all these umbrellas," she said to Jack. "There are eight and they are all broken."

"I’ll take them to the umbrella shop and have them mended," Jack said.

Jack took the eight umbrellas to the shop and left them there. "They’ll be ready tomorrow," the shopkeeper said.

That evening Jack went home from the office by bus as usual. He sat next to an old woman. She had an umbrella on the floor near her.

When the bus reached his stop, he picked up her umbrella and stood up. "Hey!" the woman said. "That’s my umbrella !"

"I’m sorry," Jack said, and at the same time he gave the umbrella to her. "I wasn’t thinking. Please excuse me."

The next day he got back the umbrellas from the umbrella shop and got on the bus.

As he sat down, a voice behind him said, "You certainly have a successful day!"

He turned around and saw the woman whose umbrella had almost been taken by him the day before.

()had the broken umbrellas mended in the umbrella shop.

A.Jack’s wife

B.Jack

C.The shopkeeper

D.The old woman

题型:判断题

有关妊娠呼吸系统变化,下列描述不正确的是()

A.功能余气量下降

B.静息通气量的增加与体重及体表面积无关

C.存在过度通气和呼吸性碱中毒

D.呼吸频率增加,肺活量下降

E.补呼气量下降

题型:判断题

老年人易发生体位性低血压的主要原因是()

A.心肌细胞增大,室壁增厚,收缩力增强

B.心肌顺应性增加,代偿能力减弱

C.心肌对肾上腺素反应下降,心率加快

D.心肌传导性减弱,血压下降

E.调节血压和血容量的功能下降

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