如果（2x-M）2=4x2-12xy+N，求M、N的值。
解：。
. It is ________ that he hasn’t________.
A．obviously; told the truth
B．obvious; told a truth
C．obvious; told the truth
D．obviously; told truth
QJZ-300/1140磁力启动器在线路电压不低于额定电压75%时，线圈应可靠吸合。（）
。
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