可变配气相位控制系统是随发动机转速的改变而使（）发生变化。
A、压缩比
B、配气正时
C、气门升程
D、汽缸排量
E、喷油正时
参考答案：B, C
We have to give the users something new ________ what we’ve already offered, which is the only way to broaden the appeal of the website.
A．regardless of
B．in addition to
C．in exchange for
D．according to
较早出现食管阻塞的食管癌，病理类型，常是
A．溃疡型B．硬化型C．蕈伞型D．髓质型E．癌侵及周围组织
