【填空题】【消耗次数：1】
由大小相等、方向相反、作用线平行的二力组成的力系，称为[填空1] 。
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相关题目
【填空题】
两力大小相等，作用线不重合的反向平行力叫[填空1] 。
【单选题】
两个力，它们的大小相等、方向相反和作用线沿同一直线。这是
①
它们作用在物体系统上，使之处于平衡的必要和充分条件；
②
它们作用在刚体系统上，使之处于平衡的必要和充分条件；
③
它们作用在刚体上，使之处于平衡的必要条件，但不是充分条件；
④
它们作用在变形体上，使之处于平衡的必要条件，但不是充分条件；
【单选题】
两根无限长平行直导线载有大小相等方向相反的电流I，并各以dI/dt的变化率增长，一矩形线圈位于导线平面内，则（）
①
线圈中无感应电流
②
线圈中感应电流为顺时针方向
③
线圈中感应电流为逆时针方向
④
线圈中感应电流方向不确定。
随机题目
【单选题】
Itsnouse_______menottoworry.
①
you tell
②
your telling
③
for you to have told
④
having told
【单选题】
Ifyouwant______youhavetogetthefundsomewhere.
①
that the job is done
②
the job done
③
to have done the job
④
the job that is done
【单选题】
While _______ the sun, the satellite has sent more than four billion bits of information back to earth.
①
having orbited
②
being orbited
③
having been orbited
④
orbiting
【单选题】
Theyareconsidering______beforethepricesgoup.
①
of buying the house
②
with buying the house
③
buying the house
④
to buy the house
【单选题】
Having no money but _______ to know, he simply said he would go without dinner.
①
not to want anyone
②
not wanting anyone
③
wanted no one
④
to want no one
【单选题】
______suchagoodchance,heplannedtolearnmore.
①
To be given
②
Having been given
③
Having given
④
Giving
【单选题】
I appreciate_______ to your home.
①
to be invited
②
to have invited
③
having invited
④
being invited
【单选题】
Silveristhebestconductorofelectricity,copper_______itclosely.
①
followed
②
following
③
to follow
④
being followed
【单选题】
_____withthesizeofthewholeearth,thehighestmountaindoesnotseemhighatall.
①
When compared
②
Compare
③
While comparing
④
Comparing
【单选题】
We hadnt met for 20 years, but I recognized her ______I saw her.
①
for the moment
②
the moment when
③
at the moment when
④
the moment