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【单选题】
正极置左下肢,负极置左上肢的导联是A.
Ⅰ导联
B.
Ⅱ导联
C.
Ⅲ导联
D.
aVR 导联
E.
aVF 导联
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举一反三
【判断题】The ball-shaped disc in a globe valve is used for microthrottling service.
A.
正确
B.
错误
【简答题】SS4改型电力机车紧急电控阀的代号为（）。
【简答题】The disc of a globe valve is designed to fit snugly into the and stop flow. Process fluid enters the globe valve and is directed through a turn to the of the seat and disc. As the fluid passes by thed...
【简答题】根据以上的粗纱机牵伸传动图计算粗纱机前后罗拉之间的牵伸倍数,(图中TDC齿轮取30齿)
【简答题】The typical globe valve consists of , , , , , , , , , and . The disc is attached to thestem in three ways: , , or .The disc can be classified as , , , or .
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