下列哪种措施可提高燃油的抗爆性().
A.在燃油中添加四乙铅
B.在燃油中添加溴化物
C.降低燃油的冰点
D.降低燃油的挥发性
参考答案:A
Will you please tell us _______ before you came to our City? [ ]
A. where do you work
B. where did you work
C. where you worked
停静电除雾器的步骤是()。
A.停止、复位、开关指向断
B.开关指向断、停止、复位
C.停止、开关指向断、复位
D.复位、停止、开关指向断