问题
选择题
Mr Holmes called at many schools_________he lived to ask them to accept his son,but he was refused everywhere for being a black.
A．where
B．around where
C．near which
D．which
答案
答案：C
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sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）
/22 A