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【简答题】
食物的特殊动力作用
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举一反三
【单选题】The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed _____.
A.
nip
B.
nap
C.
gap
D.
lip
【单选题】The external circumference of a pair of main bearing shells is slightly _____ that of the bore of the housing which receives themWhats the meaning of “that” in the sentence above?
A.
less than
B.
lighter than
C.
larger than
D.
smaller than
【单选题】已知椭圆 x 2 4 + y 2 b 2 =1 (0<b<2)与y轴交于A、B两点,点F为该椭圆的一个焦点,则△ABF面积的最大值为(  )
A.
1
B.
2
C.
4
D.
8
【单选题】已知F 1 ,F 2 是椭圆 x 2 a 2 + y 2 b 2 =1(a>b>0) 的两个焦点,AB是过F 1 的弦,则△ABF 2 的周长是(  )
A.
2a
B.
4a
C.
8a
D.
2a+2b
【单选题】已知点M(-1,2)在直线2ax-by+2=0(a>0,b>0)上,则 4 a + 1 b 的最小值是(  )
A.
4
B.
6
C.
8
D.
9
【单选题】已知抛物线x 2 =ay(a>0)的焦点恰好为双曲线y 2 -x 2 =8的焦点,则a=(  )
A.
1
B.
4
C.
8
D.
16
【简答题】已知点 A(-1,8),B(2,4),则 ∣AB∣=
【判断题】离心泵通过离心力的作用来输送和提升水体。靠高速旋转的叶轮带动叶轮中的水作圆周运动,产生离心力,水流在离心力的作用下获得压能而输送出去。( )
A.
正确
B.
错误
【单选题】The bearing shells depend on the accuracy of__to hold them in truly circular shape accuracy精确度
A.
the gap
B.
the clearance
C.
the bore
D.
the homing
【单选题】已知过点A(-2,m)和B(m,4)的直线与直线2x+y+1=0平行,则m的值为
A.
-8
B.
8
C.
0
D.
2
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