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【单选题】
修改文件“ /test.txt ”的用户属主为 userA ,则命令是( )。A.
chown userA /test.txt
B.
chown /test.txt userA
C.
chgrp userA /test.txt
D.
chgrp /test.txt userA
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举一反三
【单选题】How much money does the man want to exchange?
A.
200 US dollars.
B.
250 US dollars.
C.
300 US dollars.
D.
400 US dollars.
【简答题】试解微分方程2y(y'-1)-xy' 2 =0．
【单选题】Conerning pair production, which of the following is true?
A.
The threshold energy for pair production is 0.51 MeV.
B.
An electron and a positron are produced.
C.
The energy of the incident photon is equal to the sum of the kinetic energies of the pair of particles.
D.
Annihilation produces 1.02 MeV photons.
E.
A pair of electrons is produced.
【单选题】The turning pair which can have a whole revolution is .
A.
frame
B.
rocker
C.
full turning pair
【单选题】Which of the following is NOT a pair of additive and subtractive primary colors？
A.
Yellow and blue
B.
Magenta and green
C.
Black and white
D.
Cyan and red
【单选题】更正错账时，划线更正法的适用范围是
A.
记账凭证上会计科目或记账方向错误，导致账簿记录错误
B.
记账凭证正确，在记账时发生错误，导致账簿记录错误
C.
记账凭证上会计科目或记账方向正确，所记金额大于应记金额，导致账簿记录错误
D.
记账凭证上会计科目或记账方向正确，所记金额小于应记金额，导致账簿记录错误
【简答题】--How do lovers exchange their vows of love on St. Valentine's Day? --Through _____ _____, flowers and _____.
相关题目：
【单选题】The turning pair which can have a whole revolution is .
A.
frame
B.
rocker
C.
full turning pair