313×35-2÷115,
=103×35-2÷65,
=2-2×56,
=2-53,
=13.
A car is _____ than a truck. [ ]
A. much light
B. much lighter
C. more light
调压器是一个降压设备,其作用是降低压力,并将()压力保持在一定范围内。
A、出口
B、入口
C、管道
D、阀体