问题
选择题
He was beaten by his father because of being naughty. ____________, he became silent.[ ]
A. Since
B. Since then on
C. From that time on
D. From since on
答案
答案：C
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He was beaten by his father because of being naughty. ____________, he became silent.[ ]
A. Since
B. Since then on
C. From that time on
D. From since on
答案：C
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