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【单选题】
图(a)所示线性直流电路的戴维南等效电路如图(b)所示，则图(b)中：【图片】A.
U OC=4V, R eq =25 Ω
B.
U OC=4V, R eq =12.5 Ω
C.
U OC=2V, R eq =12.5 Ω
D.
U OC=2V, R eq =25 Ω
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举一反三
【单选题】—The electric fan can ________ blow away the terrible smell in the room, can it? —It's hard to say, but you may have a try. [ ]
A.
easily
B.
hardly
C.
quickly
D.
finally
【单选题】--The smell in the room is really terrible. You said it. Let’s keep all the windows opening .
A.
打开
B.
关闭
C.
外面
【简答题】使用命令语句来查看SELECT语句查询数据所花费的磁盘活动量信息。
【单选题】- The electric fan can ___blow away the terrible smell in the room, can it? - It’s hard to say, but we can have a try.
A.
quickly
B.
easily
C.
hardly
D.
finally
【单选题】It was worse than horrible; the smell in the room was so that it actually made me sick.
A.
exciting
B.
delighting
C.
disgusting
D.
frightening
【单选题】—The smell in the room is really terrible. —You said it. Let's keep all the windows ________. [ ]
A.
closed
B.
open
C.
broken
D.
shut
【单选题】局部自由度是指:
A.
机构局部区域的构件和运动副具有的自由度。
B.
个别构件具有的，对其它构件的运动不产生影响的自由度。
C.
个别构件具有的自由度
D.
局部机构的自由度。
【单选题】— The smell in the room is really terrible. — You said it. Let's keep all the windows _____. [ ]
A.
closed
B.
open
C.
opening
D.
to open
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