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听对话和短文，根据所提问题，选择正确答案。（对话和短文朗读两遍） 请听第1段材料，回答第1-2小题。 1. What would the woman like to buy? [ ] A. A blouse. B. A shirt. C. A dress. 2. What is it made of? [ ] A. Cotton. B. Silk. C. Cloth. 请听第2段材料，回答第3-4小题。 3. Who is still not found? [ ] A. Han Lei. B. Wei Hua. C. Da Lin. 4. Where were the people when the accident happened? [ ] A. On a train. B. On a ship. C. On a plane. 请听第3段材料，回答第5-7小题。 5. What does the Internet use to join millions of computers together around the world? [ ] A. The net. B. The telephone. C. The email. 6. Who really owns the Internet? [ ] A. People. B. Companies. C. No one. 7. What language is used by 98% of the information on the Internet? [ ] A. English. B. French. C. Chinese.
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【判断题】Any increases in materials inventory will result in a credit entry in the material control account while any reductions in materials inventory will be shown as a debit entry in the material control ac...
A.
正确
B.
错误
【单选题】有三个关系R、S和T如下:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/dda516ad0f2d47aaaccbd0ba0702b58a.png">
B.
R和S得到关系T的操作是()
C.
自然连接
D.
交
E.
投影
F.
并
【单选题】有三个关系R、S和T如下:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/b3d74da5e0b082640fa655c71928113e.png">
B.
系R和S通过运算得到关系T，则所使用的运算为().
C.
并
D.
自然连接
E.
笛卡尔积
F.
交
【单选题】有三个关系R、S和T如下:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/cbda23e4b948a89871c7cc76ac688275.jpg">
B.
系R和S通过运算得到关系T,则所使用的运算为：
C.
笛卡尔积
D.
或
E.
与
F.
自然连接
【单选题】Increases in credit cause _______________.
A.
decreases in income and increases in spending
B.
increases in income and increases in spending
C.
increases in income and decreases in spending
D.
decreases in income and decreases in spending
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