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【简答题】
在无静差转速单闭环调速系统中,转速的稳态精度是否还受给定电源和测速发电机精度的影响?试说明理由。
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举一反三
【单选题】Many early Chinese immigrants worked in the mining industry, especially in the .
A.
copper mines
B.
silver mines
C.
coal mines
D.
gold mines
【单选题】听力原文：M: In the early 1860's many more Chinese arrived in California. Was there any improvement for Chinese's living conditions? F: Oh, no. This time the men were imported as work crews to construct th...
A.
in the early 1850's.
B.
in the late 1850's
C.
in the early1860's.
D.
in the late 1860's.
【单选题】Many early Chinese immigrants worked in the mining industry, especially in the _____.
A.
gold mines
B.
silver mines
C.
coal mines
D.
copper mines
【单选题】In the early 1860's many Chinese work crews were imported to ______.
A.
be railway builders
B.
be miners
C.
do the laundry
D.
run restaurants
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