下列定积分中,( )项等于0。

A: B: C: D:

以下哪种牙体缺损不适合用充填的方法治疗()

A:后牙面洞 B:前牙切角缺损 C:面重度磨耗 D:后牙邻洞 E:楔状缺损

架上对总义齿作前伸调整时,上、下前牙接触,后牙无接触不正确的调整是()

A:压低下前牙 B:加大前牙的覆 C:减小补偿曲线曲度 D:减小前牙的覆盖 E:加大上后牙颈部向近中倾斜度

In English, solne verbs are transitive while others are intransitive in nature. Transitive verbs requires all obj ect to complete its meaning, while intransitive ones, if need be, must collocate with a preposition. In this case, both care and arrive are intransitive verbs, therefore they cannot take objects directly. The students must have confused transitive verbs with intransitive ones. This error is generally caused by lack or incomplete study of the target language.

吸引轻小物体;排斥;2

解:原式=-×36-×36+×36        

         =-18-30+21                                   

=-27 

 

如果中的解x、y相同,则m的值是( )

A:1     B:-1     C:2      D:-2

已知,求代数式的值.

 解:

   

   

时,原式.

函数y=cos 2x+2sin x的最大值和最小值分别是    .

,1

【解析】由题知y=-2+

因为≤x≤,所以≤sin x≤1,

所以当sin x=时,ymax=;当sin x=1时,ymin=1.

函数y=2sin x的值域为    .

[1,2]

【解析】根据正弦函数的图象可知,当x=时,函数取得最小值1;当x=时,函数取得最大值2.

微信扫码获取答案解析
下载APP查看答案解析