问题
选择题
In the following two hours he was _____ the performance, because it turned out to be as wonderful as he had expected.[ ]
A. tired of
B. absorbed in
C. annoyed with
D. disappointed with
答案
答案：B
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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