给汽车的铅酸蓄电池作维护时,如果蓄电池的液面低了,应给蓄电池添加()。A、蒸馏水 B

题型:单项选择题

问题:

给汽车的铅酸蓄电池作维护时,如果蓄电池的液面低了,应给蓄电池添加()。

A、蒸馏水

B、与原电解液相同密度的电解液

C、离子水

D、稀的电解液

考点:汽车修理工考试汽车修理工(中级)汽车修理工(中级)题库
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质量为0.1g的小物块,带有-5.0×10-4C的电荷量,放在倾角为30°的绝缘光滑斜面上,整个斜面置于0.5T的匀强磁场中,磁场方向如图所示,物块由静止开始下滑,滑到某一位置时,物块开始离开斜面(设斜面足够长,磁场足够大g=10m/s2

(1)物块离开斜面时的速度是多少?

(2)物块在斜面上滑行的最大距离是多大?

(3)物块离开斜面后最终的运动状态以及速度是多少?

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伤寒患儿发病1周以内常规进行的培养是()

A.血培养

B.咽拭子培养

C.尿培养

D.粪便培养

E.胆汁培养

题型:单项选择题

* * 腺病的腺上皮组织学类型为()。

A.宫颈内膜型

B.透明细胞型

C.子宫内膜型

D.中肾管型

E.输卵管上皮型

题型:单项选择题

“We do look very different; we’re older. Leo’s 38, I’m 37. We were 21 and 22 when we made that film. You know, he’s fatter now -- I’m thinner.” So says Kate Winslet, who is thrilled at the 3-D re-release of Titanic to coincide with the 100th anniversary of the ship’s demise. “It happens every time I get on any boat of any kind." She recalls. There are all the people who want her to walk to the front of the ship and re-create her famous pose, arms flung wide. Most people remember the tragedy: The British passenger ship—said to be unsinkable—hit an iceberg and sank on April 15, 1912, during its maiden voyage from England to New York City. More than 1,500 people died. But little known is what the world learned from the sinking to prevent future incidents.

Probably the greatest deficiency (不足) of the Titanic was that she was built 40 years before the widespread use of the wonderful invention radar (雷达). Her only defense against icebergs and hidden obstacles was to rely on manned lookouts. On that fateful night the eyesight of trained lookouts only provided 37 seconds of warning before the collision.

Traveling at nearly 30 miles an hour, the Titanic was moving far too fast to avoid the huge iceberg. The warning did prevent a head-on collision as the officer on the bridge managed to turn the ship slightly.

The last ship to which it could send an SOS message was the California. She was within ten miles of the Titanic during the disaster, but her radio operator went to bed at midnight and never received any of the SOS messages from the Titanic. That was one of the important lessons learned from the catastrophe, the need for 24-hour radio operators on all passenger liners.

Another lesson learned was the need for more lifeboats. The Titanic remained afloat (漂浮) for almost three hours and most of the passengers could have been saved with enough lifeboats.

1,500 passengers and workers died in the 28 degree waters of the Atlantic. Out of the tragedy, the sinking did produce some important maritime reforms. The winter travel routes were changed to the south and the Coast Guard began to keep an eye on the location of all icebergs. The new rules for lifeboats were obvious to all. There must be enough lifeboats for everybody on board.

The most important lesson learned was that no one would ever again consider a ship unsinkable—no matter how large or how well constructed. Never again would sailors place their faith in a ship above the power of the sea.

小题1:The text mainly tells us ______.

A.the reason why the Titanic sank in the Atlantic Ocean

B.how the unsinkable ship of Titanic sank in the Atlantic Ocean

C.the lessons that we could learn from the accident of the Titanic

D.the things we should do to protect the lives on the ship小题2:According to the passage, which of the following could we infer?

A.If the captain had been more careful, he could have had the chance to save the Titanic.

B.If radar had existed 40 years ago, the Titanic would have never disappeared from the world.

C.If the lookout had had much more experience, he could have had the time to save the Titanic.

D.If there had been enough lifeboats on the Titanic, the Titanic would not have sunk in the Atlantic.小题3:What would be the best title for the passage?

A.Lessons from the Titanic

B.Technology is Important

C.Demands of Passengers

D.Power of Sea小题4:What’s the sailors’ attitude towards the ships after the tragedy?

A.They think there really exists the unsinkable ship.

B.They think ships could eventually defeat the sea.

C.They think there is no power that could control the sea.

D.They think the bigger the ship is, the safer it is.

题型:单项选择题

锚杆支护的先后顺序是先顶后帮,()部自中间向两侧,帮部自上而下。

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