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【简答题】
Your teen is falling asleep in class Teens have a busy morning schedule as they need to wake up and get moving very early in order to catch a bus and get to school by the required time. This means teens need to get their rest the night before or they will be too tired to learn anything at school. 小题1: When a teen falls asleep in class, two things happen: he/she misses what is being taught and he/she loses the respect of the teacher. He/She may also receive a consequence from the school, depending on the classroom discipline policy. 小题2: To prevent your teen from being sleepy in class, try these three tips: * Set a time for “lights out” on school nights. This is never be any later than 10 p. m. and preferably 9 p.m. 小题3: Soft music can be on and used to help calm your teen. * Help your teen develop a nighttime routine that involves activities that slow them down for the end of the day. 小题4: Turning off the computer and disconnecting from friends and the excitement of the day an hour before bedtime will also help your teen relax. * 小题5: This will reinforce(增强)what it feels like to be rested and capable of accomplishing what he/she wants. A.What’s worse, they may even fall asleep in class. B.Taking a bath and reading are two activities that work well. C.Set a good example and show him/her your love for learning. D.Point out the positives after your teen has had a good night’s rest. E. “Lights out” means the computer, television, lights and cell phone should be off. F. All of these things affect your teen’s academic success and can be avoided. G. While your teen keeps his/her goals in line with your expectations, he/she may have his/her own goals.
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【判断题】若曲线y=f(x)在x=x0处有切线,则函数y=f(x)在x=x0处必可导.( )
A.
正确
B.
错误
【判断题】若函数 在点 处可导,则曲线 在点 处有不垂直于 轴的切线,则曲线 在点 处的切线方程为 ;
A.
正确
B.
错误
【多选题】关于三视图,下列说法正确的是 ( )
A.
主、左视图可反应高
B.
俯、左视图可反映宽
C.
主、俯视图可反映长
D.
主、左视图可反映长
【简答题】若函数f(x)在x=x 0 处不可导,则曲线y=f(x)在点(x 0 ,f(x 0 ))处.没有切线;
【简答题】判断下列命题是否正确?为什么? (1)若f(x)在x 0 处不可导,则曲线y=f(x)在点(x 0 ,f(x 0 ))处必无切线; (2)若曲线y=f(x)处处有切线,则函数y=f(x)必处处可导; (3)若f(x)在x 0 处可导,则|f(x)|在x 0 处必可导。
【多选题】关于三视图之间的投影关系,下列说法正确的是()。
A.
主俯视图长对正
B.
主俯视图高平齐
C.
主左视图高平齐
D.
俯左视图宽相等
【单选题】关于轴测图下列说法正确的是
A.
轴测图能真实反映物体的形状和尺寸
B.
未来轴测图将代替三视图指导生产
C.
轴测图不能代替三视图
【判断题】若函数 在点 处可导,则曲线 在点 处有不垂直于 轴的切线,而且 表示切线的斜率。
A.
正确
B.
错误
【判断题】若函数f(x)在点x=x 0 处不可导,则曲线y=f(x)在点(x 0 ,f(x 0 ))处没有切线;
A.
正确
B.
错误
【判断题】若函数f(x)在x=x 0 处不可导,则曲线y=f(x)在点(x 0 ,f(x 0 ))处没有切线.
A.
正确
B.
错误
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