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【多选题】
CC2530的串口有哪几种通信模式（）A.
UART模式
B.
串口模式
C.
SPI模式
D.
DMA模式
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反馈参考答案：
举一反三
【单选题】Direction: You are required to complete the following sentence by deciding on the most appropriate word or words from the 4 choices marked A, B, C, and D. Water power stations are built big waterfalls...
A.
which are
B.
which has
C.
where there have
D.
where there are
【单选题】Water power stations are built _____ big waterfalls and where the water runs fast.
A.
which are
B.
which has
C.
where there have
D.
where there are
【单选题】Water power stations are built _____ big waterfalls and where the eater runs fast.
A.
which are
B.
which has
C.
where there have
D.
where there are
【单选题】Power stations employ _____ water to produce electricity.
A.
falling
B.
fallen
C.
filling
D.
filled
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