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【多选题】
在关系数据库理论中,专门的关系运算包括( )。A.
笛卡尔积
B.
投影
C.
连接
D.
交叉
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举一反三
【单选题】_____________ Because I'm hot. [ ]
A.
I want to put on my jacket.
B.
I want to take off my jacket.
C.
I want to wear my jacket.
【单选题】Don't ___ __ my bread . I want to eat it now. [ ]
A.
take to
B.
take off
C.
take away
【多选题】下列经济业务中,引起会计恒等式左右两方同时发生增减变化的有( ) A 、投资者投入资本 B、以存款归还借款 C、收到应收款存入银行 D、从银行提取现金
A.
A
B.
B
【单选题】My parents want me to take _____ maths lessons at the weekend, but I want to play and have fun. [ ]
A.
extra
B.
available
C.
former
D.
recent
【单选题】My parents want me to take ______ maths lessons at the weekend, but I want to relax myself.
A.
extra
B.
average
C.
free
D.
fond
【单选题】I don’t want to _______ his invitation to dinner.
A.
take in
B.
take up
C.
take over
D.
take out
【单选题】【单选】船舶靠码头操纵之前，应作哪些准备工作？Ⅰ掌握港口信息；Ⅱ掌握本船情况；Ⅲ制定操纵计划；Ⅳ了解大洋航路
A.
Ⅰ、Ⅲ、Ⅳ
B.
Ⅱ、Ⅳ
C.
Ⅰ-Ⅲ
D.
Ⅰ、Ⅱ、Ⅳ
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