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【单选题】
WINDOWS中彻底删除文件的操作,正确的是( ).A.
选定文件后,同时按下SHIFT与DEL键
B.
选定文件后,同时按下CTRL与DEL键
C.
选定文件后,按DEL键
D.
选定文件后,按SHIFT键后,再按DEL键
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举一反三
【单选题】Tom, turn down the music. Why _____ you make such a big noise while your baby sister is sleeping? [ ]
A.
must
B.
would
C.
should
D.
may
【单选题】Why does Jane refuse Tom's invitation?
A.
Because she wants to study for a test.
B.
Because she wants to go swimming at the student center.
C.
Because she has to do research in the library.
D.
Because she is not interested in the man.
【单选题】1mol/L HAc 溶液中 HAc 的 α = 1.33% , 则 [H + ] 为: ( ) mol/l.
A.
1.33× 10 -3
B.
1.33× 10 -2
C.
1.33× 10 -1
D.
1.33
【单选题】在 50mL0.1 mol ·L -1 HAc溶液中加入等体积水稀释,对稀释后的水溶液而言,下列叙述正确的是 A B C D
A.
HAc 的解离度 α 减小，溶液的 pH 值减小
B.
HAc 的解离度 α 增大，溶液的 pH 值增大
C.
HAc 的解离度 α 增大，溶液的 pH 值减小
D.
HAc 的解离度 α 增大， HAc 的解离常数增大
【单选题】Tom, turn down the music. Why ____ you make such a big noise while your baby sister is sleeping? [ ]
A.
could
B.
would
C.
should
D.
must
【单选题】1mol/lHAc 溶液中 HAc 的 α = 1.33%, 则 [H+] 为( ) mol/l.
A.
1.3 3×10 -3
B.
1.33×10 -2
C.
1.33×10 -1
D.
1.33
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