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【单选题】
Tom's new teacher is______.
A.
a man
B.
very old
C.
a woman
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【简答题】中间继电器的主要作用有哪些?
【单选题】点M(a,b)在由不等式组 确定的平面区域内,则点N(a+b,a-b)所在平面区域的面积是
A.
1
B.
2
C.
4
D.
8
【单选题】Medieval travelers' tales of fantastic creatures were often fascinating but not always ______.
A.
creditable
B.
imaginable
C.
credible
D.
conceivable
【单选题】One of the things we have to do to prevent a pandemic is to make sure people understand and know what they can do to minimize the commotion.
A.
command
B.
collusion
C.
turmoil
D.
tutelage
【单选题】已知点M(a,b)在由不等式组 确定的平面区域内,则点N(a+b,a-b)所在平面区域的面积是 [     ]
A.
1
B.
2
C.
4
D.
8
【简答题】家庭净水器的基本原理可用如图3 -3-l所示的简易净水装置表示。其中所用的小鹅卵石、石英砂的作用是____,起吸附活性炭作用的是 。
【单选题】The travelers were_____into silence by the Sight of a distant mountain.
A.
enlivened
B.
awed
C.
forced
D.
frightened
【单选题】已知D是由不等式组 x+2y≥0 2x-y≥0 所确定的平面区域,则圆x 2 +y 2 =4在区域D内的弧长为(  )
A.
π 4
B.
π 2
C.
π
D.
【单选题】对函数 ,下列结论成立的是
A.
是函数的第一类可去间断点
B.
是函数的第一类跳跃间断点
C.
是函数的第二类无穷间断点
D.
是函数的第二类振荡间断点
【单选题】One of the greatestof unhappiness,in my experience,is the difficulty we have in accepting things
A.
30.One of the greatest of unhappiness,in my experience,is the difficulty we have in accepting things as they are. A.reasons
B.
styles
C.
supplies
D.
Sources
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