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【简答题】
删除计算机系学生(在student表中)的修课记录(在SC表中)的语句,正确的是( )。 A. DELETE FROM SC JOIN Student b ON S.Sno = b.Sno WHERE Sdept = '计算机系' 不正确 B. DELETE FROM SC FROM SC JOIN Student b ON SC.Sno = b.Sno WHERE Sdept = '计算机系' C. DELETE FROM Student WHERE Sdept = '计算机系' D. DELETE FROM SC WHERE Sdept = '计算机系'
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】I had not been invited to the party,so I felt______and a bit hurt.
A.
left out
B.
left behind
C.
left behind
D.
left off
【单选题】The moment I got home, I found I _____ my jacket on the playground. [ ]
A.
had left
B.
left
C.
have left
D.
was leaving
【单选题】下列哪种误差不属于操作误差( )。
A.
操作人员粗心大意、加错试剂
B.
操作人员给容量瓶定容时，视线习惯性偏低
C.
进行滴定管读数时，操作人员的视线习惯性偏高
D.
读取吸量管体积读数时，操作人员习惯性偏低
【单选题】下列哪种误差不属于操作误差:
A.
操作人员给容量瓶定容时，视线习惯性偏低
B.
操作人员转移溶液时不小心洒落到容器外少许
C.
读取吸量管体积读数时，操作人员习惯性偏高
D.
操作人员对于颜色变化反应迟钝，造成反应结束时溶液颜色偏深
【单选题】Only when they came ___________.
A.
I left the office
B.
did I leave the office
C.
left I the office
D.
I did leave the office
【单选题】---Who left the window _______? --- Sorry. I forgot _______it when I left yesterday.
A.
opened; to close
B.
open; to close
C.
open; closing
D.
opening; closing
【单选题】下列哪种误差不属于操作误差()
A.
操作人员粗心大意、加错试剂
B.
操作人员对于滴定终点指示剂变色反应迟钝,造成终点溶液颤色偏深
C.
操作人员给容量瓶定容时,视线习惯性偏低
D.
进行滴定管读数时,操作人员的视线习惯性偏高
E.
读取吸量管体积读数时,操作人员习惯性偏低
【简答题】Hardly ______ the office when it began to rain. A) did I leave B) had I left C) I left D) I had left
【单选题】I had not been asked to the party, so I felt ______ and a bit hurt.
A.
left out
B.
left behind
C.
left alone
D.
left off
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