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【单选题】
关于刚体,下列说法正确的是:A.
刚体所受合外力为零，则刚体所受的合外力矩也为零；
B.
刚体所受合外力矩为零时，刚体角速度一定为零
C.
刚体所受合外力矩不为零时，刚体角速度会发生变化
D.
刚体平衡的条件是：它所受到的合外力为零.
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反馈参考答案：
举一反三
【单选题】— Shall we go and visit Mr. Wang tomorrow? — _____. [ ]
A.
It depends
B.
That depends on
C.
It is depended
D.
That depends so
【单选题】Whether the game will be played ___ the weather.
A.
according to
B.
depends by
C.
depends on
D.
relies with
【简答题】设全集U={a，b，c，d}，集合A={a，b}，B={b，c，d}，则（? U A）∪（? U B）=（ ）。
【单选题】We can conclude from the text that______.
A.
American cities are changing far the worse
B.
people have different views on American cities
C.
many people are now moving from American cities
D.
the population is decreasing in older American cities
【单选题】设全集 U={a,b,c,d},集合A={a,c},B={b,c}, 则C U B∪A为 ( )
A.
{a,c,d}
B.
{a，b，d}
C.
{a，b，c}
D.
{b，c，d}
【简答题】设全集U={a，b，c，d，e}，集合A={a，b}，B={b，c，d}，则A∩C U B=______．
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