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【单选题】
由属于R但不属于S的所有元组组成的结果关系是( )A.
R并S
B.
R交S
C.
R差S
D.
R除S
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反馈参考答案：
举一反三
【单选题】听力原文：M: When will the English evening be taking place? W: It's at 7:00 on Friday evening. M: Where will the English evening be held? W: In the department hall M: Who will attend the party? W: All the ...
A.
At 17:00 on Friday evening.
B.
At 7:00 on Friday evening.
C.
At 6:30 on Friday evening.
D.
At 7:00 in Friday morning.
【单选题】听力原文：M: When will the English Evening be taking place? W: It's at 7:00 on Friday evening. M: Where will it be held? W: In the department hall. M: Who will attend? W: All the students of our department...
A.
At 17:00 on Friday evening.
B.
At 7:00 on Friday evening.
C.
At 6:30 on Friday evening.
D.
At 7:00 on Friday morning.
【单选题】听力原文：M: When will the English evening be taking place? W: It's at 7:00 on Friday evening. M: Where will the English evening be held? W: In the department hall M: Who will attend the party? W: All the ...
A.
At 17:00 on Friday evening.
B.
At 7:00 on Friday evening.
C.
At 6:30 on Friday evening.
D.
At 7:00 in Friday morning.
【简答题】正平面在正立投影面的投影反映实形。 判断对错
【单选题】听力原文：M: When will the English evening be taking place? W: It's at 7:00 on Friday evening. M: Where will the English evening be held? W: In the department hall M: Who will attend the party? W: All the ...
A.
At 17:00 on Friday evening.
B.
At 7:00 on Friday evening.
C.
At 6:30 on Friday evening.
D.
At 7:00 in Friday morning.
【单选题】听力原文：M: When will the English Evening be taking place? W: It's at 7:00 on Friday evening. M: Where will it be held? W: In the department hall. M: Who will attend? W: All the students of our department...
A.
At 17:00 on Friday evening.
B.
At 7:00 on Friday evening.
C.
At 6:30 on Friday evening.
D.
At 7:00 on Friday morning.
【单选题】Remove the batteries when they become weak or when the unit is not in use for extended periods. This will damage to the unit from battery leakage at such times.
A.
disappoint
B.
concern
C.
instruct
D.
prevent
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