如图所示，＝3000，电压表1的内阻为6000，电压表2的内阻为3000. 已知

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问题问答题

如图所示，＝3000，电压表1的内阻为6000，电压表2的内阻为3000. 已知断开，接1时，电压表1的读数是4V；闭合, 接1时,电压表1的读数是8V；闭合，接2时，电压表2的读数是7.5V，求的阻值．

答案

单项选择题

When in command of a lifeboat under oars，the command TOSS OARS means to（）.

A.lift oars to vertical position，trim blades fore and aft with handles resting on the thwarts

B.complete the stroke，come to Oars，raise the oars smartly to the vertical，rest handles on footings and trim blades fore and aft

C.place oars in row locks directly from the boated position or from Stand by oars position

D.complete the stroke (when rowing in ahead motion)，raise the oars with crook of elbow to about 30 degrees，swing blades forward

判断题

硬聚氯乙烯风管质量标准规定：焊缝应饱满，焊条排列应整齐，无焦黄、断裂现象。( )