皮皮学，免费搜题
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【单选题】
51单片机的工作电压Vcc为_______V。A.
3
B.
4
C.
5
D.
10
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皮皮学刷刷变学霸
举一反三
【单选题】According to the passage, the aim of the teacher is to ______.
A.
train his pupils to reach quickly the stage of reading without having to concentrate on the separate symbols
B.
help his pupils look at each printed symbol for its meaning as well as for its shape
C.
help his pupils avoid taking long jumps and making short pauses while they are trying to get the meaning of what they are reading
D.
tell his pupils different reading stages, of which the first one is to recognize the separate printed symbols