【单选题】查找包含banana和apple的信息,命令正确的是?
A.db.test.find({"fruits":["banana","apple"]})
B.db.test.find({"fruits":{$all:["banana","apple"]}})
C.db.test.find({"fruits":{$in:["banana","apple"]}})
D.db.test.find({"fruits":["apple","banana"]})
A.db.test.find({"fruits":["banana","apple"]})
B.db.test.find({"fruits":{$all:["banana","apple"]}})
C.db.test.find({"fruits":{$in:["banana","apple"]}})
D.db.test.find({"fruits":["apple","banana"]})
利用广义表的head和tail操作写出函数表达式,把以下各题中的单元索banana从广义表中分离出来:
(1)Ll(apple,pear,banana,orange)
(2)L2((apple,pear),(banana,orange))
(3)L3(((apple),(pear),(banana),(orange)))
(4)L4(((〔apple))),((pear)),(banana),orange)
(5)L5((((apple)+pear),banana),orange)
(6)L6(apple,(pear,(banana),orange))
A.apple:apple
B.carrot:apple
C.apple:banana
D.banana:apple
E.carrot:carrot
F.carrot:banana
The hyponyms of ‘vegetable’ are()
A、banana, pear, jam
B、pear, apple, banana
C、cucumber, celery, peas
D、tree, pine, elm
A.on, in
B.in, in
C.on, on
D.in, on
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