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【单选题】
在对控制系统稳态精度无明确要求时,为提高系统的稳定性,最方便的是A.
减小增益
B.
超前校正
C.
滞后校正
D.
滞后 - 超前
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【单选题】导线全长620m,算得x坐标增量闭合差为0.12m,y坐标增量闭合差为-0.16m,则导线全长相对闭合差为( )。
A.
1/2200
B.
1/3100
C.
1/4500
D.
1/4500
【单选题】在导线计算时，坐标增量闭合差fx=-0.08m、fy=+0.07m，导线总边长为475.74m，则导线全长相对闭合差为（ ）。
A.
1/4400
B.
1/2000
C.
1/440000
D.
1/5400
【单选题】听力原文：M: Hello. W: Is this Mr. Green's office? M: Yes, it is. W: Is he there? M: I'm sorry, he isn't. He's at a meeting this morning. W: What time will he be back? M: He'll be back after two o'clock bu...
A.
Answering the phone.
B.
Having a meeting.
C.
Working in the office.
【单选题】导线全长620m,算x坐标增量闭合差为0.12m,y坐标增量闭合差为-0.16m,则导线全长相对闭合差为( )。
A.
1/2200
B.
1/3100
C.
1/4500
D.
1/15500
【简答题】Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again SARS, so we only had time for a few words. A. just left B. has just left C. is just leaving...
【单选题】导线全长620m,算得x坐标增量闭合差为0.12m,y坐标增量闭合差为-0.16m,则导线全长相对闭合差为( )。
A.
1/2200
B.
1/3100
C.
1/4500
D.
1/15500
【单选题】Unfortunately, when I arrived she ______, so we only had time for a few words.
A.
just left
B.
has just left
C.
was just leaving
D.
had just left
【单选题】某导线全长620m,算得x坐标增量闭合差为0.12m,y坐标增量闭合差为-0.16m,则导线全长相对闭合差为( )。
A.
1/2200
B.
1/3100
C.
1/4500
D.
1/15500
【单选题】---Is that Bruce speaking? ---Sorry, he is out. He _______abroad on business.
A.
has gone
B.
has been
C.
went
D.
goes
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