测试油介损时，所用介损油杯注油前应对空杯进行（）倍工作电压的耐压试验。
A.1
B.1.5
C.2.5
D.3
参考答案：B
The _____ girl was last seen _____ flowers near the river. [ ]
A. missing; picking
B. missing; pick
C. missed; picked
D. missed; to pick
装载机安全驾驶操作规程规定，装载机运载物料时，应保持动臂下铰点离地面200毫米以上。
