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【单选题】
在网络互连中,中继器一般工作在()。A.
物理层
B.
应用层
C.
传输层
D.
网络层
手机使用
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举一反三
【简答题】The boy is waiting for his mothe under the big tree .
【单选题】Mothe r looked ________ when she received our presents.
A.
angry
B.
angrily
C.
happy
D.
happily
【单选题】While mothe_______some washing, I _____ a kite for Kate
A.
did, made
B.
was doing,made
C.
was doing, was making
【单选题】I have to leave now because I _________ to go shopping with my mothe
A.
said
B.
will
C.
promised
D.
suggested
【单选题】听下面一段材料，回答问题。 Who are the two speakers? [ ]
A.
Brother and sister
B.
Father and mothe
C.
Teacher and student
【单选题】泵或风机串联运行时,以下说法错误的是 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> ( A )两台不同性能泵或风机串联运行时,性能曲线平缓的泵或风机可能出现停机的现象; ( B )管网不发生变化时,单台运行泵或风机的流量小于串联运行时单台设备的流量; ( C )管网不发生变化时,单台运行泵或风机的压头...
A.
（ A ）两台不同性能泵或风机串联运行时，性能曲线平缓的泵或风机可能出现停机的现象； prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
B.
（ B ）管网不发生变化时，单台运行泵或风机的流量小于串联运行时单台设备的流量； prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
（ C ）管网不发生变化时，单台运行泵或风机的压头大于串联运行时单台设备的压头； prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
D.
（ D ）串联运行的泵或风机，流量不变，总压头等于各设备流量之和。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
相关题目：
【单选题】Mothe r looked ________ when she received our presents.
A.
angry
B.
angrily
C.
happy
D.
happily
参考解析：
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