【单选题】British scientists said teenagers are programmed to take risks because they enjoy the thrill of
A.
30. British scientists said teenagers are programmed to take risks because they enjoy the thrill of dangerous situations________ others. A.more than
【简答题】计算 (1)sin245°- cos60°+ tan60°cos230° (2)
【简答题】求值:sin 2 45°-cos60°+tan60°?cos 2 30°.
【简答题】1 4 ta n 2 45°+ 1 sin 2 30° -3co s 2 30°+ tan45° cos0° - sin40° cos50° .
【简答题】计算题. (1) sin30°-cos45° cos60°-sin45° (2)(tan45°) 2 - cos 2 30°-2cos30°+1 .
【单选题】Pupils usually would like to take ________ advice their teachers give.A.whicheverB.howeverC.what
A.
30. Pupils usually would like to take ________ advice their teachers give. A.whichever
【单选题】下列哪个叙述是正确的? A. abstract类中,必须要有abstract方法。 B abstract方法的abstract关键字,必须放在方法的类型的前面,不可以插在方法类型和方法名字之间。 C. abstract类中不能有非abstract实例方法。 D. static方法也可以是abstract方法。
【单选题】以下有关类的继承的叙述中,正确的是()
A.
子类能直接继承父类所有的非私有属性,也可通过接口继承父类的私有属性
C.
子类只能继承父类的非私有属性,不能继承父类的方法
【单选题】She urges me ____ steps in the matter.