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【简答题】
求下列曲线段的弧长：a)yˆ2=2x,0≤x≤2;b)y=1nx,√3≤x≤√8 求下列曲线段的弧长：
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反馈参考答案：
举一反三
【简答题】在作业中断期间,未征得工作领导人同意,作业组成员不得擅自进入__________ 。
【单选题】小间隙将使磨损增加,甚至使模具与材料之间产生粘结现象,并引起崩刃、凹模胀裂、小凸模折断、凸凹模相互啃刃等异常损坏。为了延长模具寿命,在保证冲裁件质量的前提下适当采用( )的间隙值是十分必要的。
A.
较大
B.
较小
C.
任意
【单选题】Despite the fact that Maria had put on much make-up on her face, the skin on her neck ____ her real age. [ ]
A.
gave out
B.
gave away
C.
gave up
D.
gave off
【单选题】Despite her illness, Lucy had lost ___of her enthusiasm for life and still made many plans for the future.
A.
neither
B.
both
C.
all
D.
none
【单选题】To her amazement, her son was ________ for her willingness to call and offered an apology of his own. [ ]
A.
grateful
B.
reliable
C.
stubborn
D.
peaceful
【单选题】Her voice was shaking despite the fact ________ she tried her best to control it.
A.
when
B.
which
C.
where
D.
that
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