A.Because there was a shortage of men and women in the area.
B.Because mining communities were then separated from the rest of the country.
C.Because the mining tunnels were too low for the horses to pull trucks of coal through.
D.Because the mine owners were unable to make men and women work longer hours and stay down the mine all day.
第1题
用同心针电极进行肌电图检查时,MUAP一般为
A、1~2相
B、2~3相
C、1~4相
D、1~3相
E、2~4相
第4题
在肌电图中,正常运动单位电位为
A、1~3相,第1相为负相
B、2~3相,第1相为正相
C、1~4相,第1相为负相
D、1~4相,第1相为正相
E、3~5相,第1相为负相
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