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【单选题】
一般情况下,人体安全电压为( )。A.
12V
B.
24V
C.
42V
D.
220V
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举一反三
【简答题】After learning the five-part materials, here's the quiz you'll need to finish. You can type up your answers here or upload a picture of your answers, but in either way remember to write the number bef...
【单选题】听力原文：M: Did you remember to bring the book you promised me? W: I'm sorry. It completely slipped my mind. I'll bring it tomorrow. Q: Why did the woman apologize? (15)
A.
She had lost the book.
B.
He had brought the wrong book.
C.
She had forgotten the book.
D.
He wasn't able to bring the book.
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