题目内容
掌握学习是一种教学方法，也就是指在学习下一个单元前学生必须通过前一单元的一定水平的_________。
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认知行为矫正是以行为和认知学习原理为基础，通过_________和_________来改变自己行为的程序。
Engine block, cylinder block, or simply block are the terms likely to be heard in the garage or on the street.The engine block is the key of vehicles that run on internal combustion engines, providing the powerhouse for the vehicle.
It is called a block because it is usually a solid cast car part, housing the cylinders and their components inside a cooled and lubricated crankcase.
The core of the engine block is the cylinder, capped by the cylinder head.
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