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【单选题】
切削的三要素有进给量、背吃刀量和( )。A.
切削厚度
B.
切削速度（主轴转速）
C.
进给速度
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举一反三
【单选题】The ocean water in the region where the storm forms
A.
is heating the hurricanes
B.
evaporates and becomes fuel
C.
heads toward land
D.
turns into water vapor that makes hurricanes stronger
【单选题】The house had one of the windows in the storm yesterday.
A.
breaking
B.
broken
C.
to be broken
D.
break
【单选题】What does "the eye of the storm wanna cry in the morn" imply?
A.
It implies that the singer is caught by the storm in the morning
B.
It implies that the singer often cries in the morning
C.
It implies that "trouble" comes unexpectedly
D.
It implies that the singer's mood changes quickly
【单选题】After the storm in Beijing, people were suffering in that area, ________ urgently needed clean water, medicine and shelter to survive.
A.
which
B.
who
C.
where
D.
what
【单选题】听力原文： The US president's helicopter flew over the path of the deadly storm in the state of Alabama, where eight teenagers were killed Thursday in the collapse of a high school in the town of Enterpris...
A.
To find out the lost people and animals.
B.
To criticize the authority's poor response.
C.
To assess the federal assistance needed.
D.
To make clear the investment in agriculture.
【简答题】已知函数 f(x)= a? 2 x 2 x + 2 的图象过点 (0， 2 -1) ． （1）求f（x）的解析式； （2）设P 1 （x 1 ，y 1 ），P 2 （x 2 ，y 2 ）为y=f（x）的图象上两个不同点，又点P（x P ，y P ）满足： OP = 1 2 ( O P 1 + O P 2 ) ，其中O为坐标原点．试问：当 x P = 1 2 时，y P 是否为定值？若是，求出y P...
【单选题】The storm in___ early summer caused__ heavy damage to the crops ready to be harvested.
A.
[A] the;/
B.
[B] an;the
C.
[C] / ;the
D.
[D] an;a
【单选题】听力原文： The US president' s helicopter flew over the path of the deadly storm in the state of Alabama, where eight teenagers were killed Thursday in the collapse of a high school in the town of Enterpri...
A.
To find out the lost people and animals.
B.
To criticize the authority' s poor response.
C.
To assess the federal assistance needed.
D.
To make clear the investment in agriculture.
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