clearance，C

1、预检（Pre-clearance）

预检（Pre-clearance）

2、Reducing the clearance between a valve

Reducing the clearance between a valve stem and rocker arm will result in the valve （）Ahaving a shorter duration of openingBhaving a longer duration of openingCclosing soonerDopening later

3、Clearance volume scavenging in a turbo

Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pisto

4、Clearances of bridges and overhead cab

Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.Alower low waterBhigh waterClow waterDsea level

5、Increasing the valve clearance between

Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）Aclosing laterBopening soonerCstaying open for a shorter period of timeDstaying open for a longer period of time

6、启动子的清除（promoter clearance）

启动子的清除（promoter clearance）