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【单选题】
泵的有效功率又称作是( ),它是指单位时间内流过水泵的液体从水泵那里得到的能量。A.
输入功率
B.
轴功率
C.
输出功率
D.
额定功率
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举一反三
【单选题】__________ are good friends .
A.
Lily,I and you
B.
Lily, you and I
C.
You, Lily and me
D.
You, Lily and I
【单选题】在 Windows中,若要恢复回收站中的文件,在选择待恢复的文件后应选择( )命令。
A.
“恢复此选项”
B.
“撤销此选项”
C.
“还原此选项”
D.
“后退此选项”
【单选题】在 windows中,若要恢复回收站中的文件,在选择待恢复的文件后应选择( )命令。
A.
“恢复此选项”
B.
“撤销此选项”
C.
“还原此选项”
D.
“后退此选项”
【单选题】听力原文：W: I guess I'll send Lily a postcard from Venice when I go there on my trip. M: I'm sure that she'd be happy to get one. She has a collection of cards from all over the world. Q: What do we learn...
A.
She is going to Venice.
B.
She travels around the world.
C.
She likes to collect postcards.
D.
She is going on vacation.
【单选题】—Have you ever heard from Lily and Mary? —I havent heard from______of them.
A.
neither
B.
any
C.
either
D.
all
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