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【单选题】
A uni feedback system, the process is【图片】The system is controlled by a proportional controller【图片】,【图片】The value of K that yields a steady-state error【图片】 witha magnitude equal to 0.01 for a unit step input is:A.
K = 49
B.
K=99
C.
K=169
D.
None of the above
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举一反三
【单选题】----What were you doing this time yesterday? ----I ________ my homework at John’s house.
A.
do
B.
am doing
C.
did
D.
was doing
【多选题】皮下注射与肌内注射的相同点是( )
A.
注射时针头与皮肤成30°～40°角
B.
注射时针头与皮肤成90°角
C.
以2%碘伏及70%乙醇消毒局部皮肤
D.
进针深度为针梗的1/2～2/3
E.
进针后抽吸无回血方可推药
【单选题】What are the children doing on Halloween? They are having “_______” from house to house.
A.
a party
B.
a trick or treat
C.
a big dinner
【单选题】The trucks passing up and down the street are damage to our house and historic interest. [ ]
A.
doing
B.
raising
C.
putting
D.
producing
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