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【单选题】
3kg 物体,从高 45 m 处自由落下( g 取 10 m/s 2 ),在下落的过程中A.
前 2 s 内重力做功为 300 J
B.
前 2 s 内重力做功的功率为 675 W
C.
第 2 s 末重力做功的功率为 600 W
D.
第 1 s 末重力做功的功率为 350 W
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举一反三
【简答题】报告文学的基本特征?
【单选题】Which statement about comments is false?
A.
Comments begin and end with /* and */ , respectively.
B.
Programmers insert comments to document programs and improve program readability.
C.
Comments do not cause any machine language object code to be generated.
D.
Lengthy comments can cause poor execution-time
【简答题】试比较小说与报告文学的基本特征。
【单选题】Her comments about men are utterly ridiculous
A.
slightly
B.
partly
C.
completely
D.
faintly
【单选题】Her comments about men are utterly ridiculous.
A.
slightl
B.
partly
C.
faintly
D.
completely
【单选题】Her comments about men are utterly ridiculous．
A.
slightly
B.
partly
C.
faintly
D.
completely
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