如图所示,一个可视为质点的质量为m的小球以初速度v飞出高为H的桌面,当它经过距离

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问题:

如图所示,一个可视为质点的质量为m的小球以初速度v飞出高为H的桌面,当它经过距离地面高为hA点时,所具有的机械能是(以桌面为零势能面,不计空气阻力)

[ ]

A.mv2        

B.mv2mgh

C.mv2mgh  

D.mv2mg(Hh)

考点:机械能守恒定律
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子女对父母的孝敬,最重要的是尊敬和爱戴父母。 [ ]

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词语释义。
1. This much-loved and active sport is enjoyed by many.
[ ]
A. popular
B. love
C. like
2. This beverage was discovered over three thousand years ago.
[ ]
A. above
B. more than
C. about
3. They can make desks.
[ ]
A. are able to
B. are
C. /
4. His bag is filled with books.
[ ]
A. full with
B. is full of
C. is full with
5. She would love to sail across the Pacific Ocean
[ ]
A. like
B. had like to
C. would like to
题型:不定项选择

在职业接触限值中,短时间接触容许浓度表示为()

A.PC-TWA

B.PC-STEL

C.MAC

D.OEL

E.WBTG

题型:不定项选择

我国著名的雕塑作品《奉先寺卢舍那大佛像》位于______。( )

A.龙门石窟

B.云岗石窟

C.麦积山石窟

D.敦煌莫高窟

题型:不定项选择

现患乳腺癌者不能服用单纯孕激素类避孕药。

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