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【单选题】
重复性是传感器在输入量按( )作全量程多次测试时,所得特性曲线不一致性的程度。A.
同一方向
B.
相反方向
C.
从大到小
D.
从小到大
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反馈参考答案：
举一反三
【简答题】已知点A（-2，0），B（1，0），平面内的动点P满足|PA|=λ|PB|（λ为常数，λ＞0）． （1）求点P的轨迹E的方程，并指出其表示的曲线的形状． （2）当λ=2时，P的轨迹E与x轴交于C、D两点，M是轨迹上异于C、D的任意一点，直线l：x=-3，直线CM与直线l交于点C′，直线DM与直线l交于点D'．求证：以C′D′为直径的圆总过定点，并求出定点坐标．
【单选题】听力原文：M: I can't stand living in this place any more. W: Well, why don't you move then? Q: What does the woman suggest the man to do? (5)
A.
Stand still.
B.
Sit down.
C.
Get exercises.
D.
Change the house.
【单选题】听力原文：M: I don't think we can find a better restaurant around here at this time. W: Let's walk a little further to see if there is another one. I just can't bear the noise here. Q: What will the speake...
A.
Look for a better restaurant.
B.
Go to another restaurant by bus.
C.
Take a walk around the city.
D.
Try to find a quiet place.
【单选题】′′a,b是异面直线′′是指1a b= ,且a不平行于b;2a ⊂ 平面α,b ⊂ 平面β,且a b= 3a ⊂ 平面α,b¢平面α 4不存在平面α,能使a ⊂ α,且b ⊂ α成立
A.
①②
B.
①③
C.
①④
D.
③④
【单选题】I don't have ______ time as you do to stand around and talk.
A.
so much
B.
as much
C.
as much as
【简答题】化验室蒸馏低沸点易燃液体时，应采用密闭时电热管的（）或红外线灯加热；尽量避免用（）加热。
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