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【多选题】
下列有体切割器械的说法中,正确的是______。A.
在牙体切割中，选用的金刚砂车针应不易变形，具有较高的稳定性和抗断裂能力，无尖端折断或，旋转同心度好
B.
使用金刚砂车针进行牙体切割时，使用的力量以70-100g为宜
C.
切割中，应该尽量选用细粒度的车针，以使预备的牙体表面光滑
D.
对于临床牙冠较长的牙的龈1/3预备时，常使用长柄金刚砂车针
E.
粗粒度金刚砂车针柄上标有蓝色色环
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举一反三
【单选题】Among those which is deemed sales? ( )
A.
the manufacturer transfers purchased goods from its head office to the branch for sales and both are in same county
B.
the manufacturer uses goods purchased for equity investment
C.
the manufacturer uses goods purchased for staff welfare or social intercourse
D.
the manufacturer uses goods purchased for continuous production
【简答题】已知二次函数y=x 2 ﹣4x﹣3，若﹣1≤x≤6，则y的取值范围为( )
【多选题】Among those which is deemed sales? ( )
A.
the enterprise uses self-produced goods for employees’ welfares
B.
the enterprise uses self-produced goods for dividend distribution
C.
the enterprise uses purchased goods for employees’ welfares
D.
the enterprise uses purchased goods for dividend distribution
【多选题】Among those which is deemed sales? ( )
A.
the enterprise has equity share by investing self-produced goods
B.
the enterprise donates self-produced goods to the people suffered from natural disaster
C.
the enterprise purchases alarm device for coal mine workers
D.
the enterprise sponsors a TV show with purchased goods
【简答题】已知二次函数y =' x2' －4x ＋3． （1）用配方法将y =' x2' －4x ＋3化成y =' a(x' －h) 2 ＋ k的形式； （2）在所给的平面直角坐标系中，画出这个二次函数的图象； （3）根据图象回答：当自变量x的取值范围满足什么条件时，y＜0？
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