portable ram外置式油缸portableadj.轻便的；手提式的；[计]可移植的n.便携的东西portable video tape recorder手提式磁带录像机portable X-ray fluorometer轻便X射线荧光仪Portable Data Program System便携式数据程序系统portable crank shaft grinder移动式曲轴磨床Portable Electronic Telephone轻便电子电话机portable ultrasonic flowmeter便携式超声波流量计portable sound film projector移动式有声电影放映机portable aspirating equipment便携式吸气装备Portable exhaust gas analyzer便携式气体分析仪portable gamma spectrum meter便携式γ谱仪