What should you do when your parents become1. _______angry? If your parents got mad, try to have a conversation2. _______with them about it . Remembering not to shout 3. _______at them. They usuall
There is no doubt . A．whether he will finish the work on time B．if he will finish the work on time. C．that he will finish the work on time. D．how he will finish the work on tim
：
和
：
．当
取何值时：（1）两圆内含？（2）两圆相交？
， 
，
，
，
．
，
． 
，∴
，即
或
，
，解得
，解得
．