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【单选题】
印刷线路板元器件插装应遵循（）的原则。
A.
先大后小、先轻后重、先高后低
B.
先小后大、先重后轻、先高后低
C.
先小后大、先轻后重、先低后高
D.
先大后小、先重后轻、先高后低
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers