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【单选题】
真空吸啜结束后,正确的关机顺序是A.
先将吸力强度调节零,再关电源,最后将吸管移开皮肤
B.
先将吸管移开皮肤,再将吸力强度调节零,最后关电源
C.
先关电源,再将吸管移开皮肤,最后将吸力强度调节零
D.
先将吸管移开皮肤,再直接关电源
E.
先将吸力强度调节零,再将吸管移开皮肤,最后关电源
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