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【单选题】
判断 char 型变量 c1 是否小写字母的正确表达式为 ( )A.
'a'<=c1<='z'< p="">
B.
(c1>='a')&&(c1<='z')< span="">
C.
(c1>=a)&&(c1<=z)< span="">
D.
('a'<=c1)||('z'>=c1)
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【单选题】Two wheels initially at rest roll the same distance without slipping down identical inclined planes starting from rest. Wheel B has twice the radius but the same mass as wheel A . All the mass is conc...
A.
Wheel A
B.
Wheel B
C.
The kinetic energies are the same.
D.
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【单选题】Inclined planes in a three-view drawing will appear as:
A.
two surfaces and one edge
B.
two edges and one surface
C.
three edges
D.
foreshortened in each view
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