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【单选题】
制造镜架的铜合金材料分为锌白铜,( )A.
黄铜,青铜
B.
洋银,铜镍锌锡合金和青铜
C.
黄铜,铜锌合金和青铜
D.
黄铜,铜镍锌锡合金和不锈钢
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举一反三
【单选题】修改student表结构，将非空约束student_sname_nn设置为禁用。
A.
alter table student disable constraint student_sname_nn;
B.
alter table student enable constraint student_sname_nn;
C.
alter table student disable student_sname_nn;
D.
alter table student enable student_sname_nn;
【简答题】阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。 A. When did you buy it? B. It’s much better than before. C.When does it start? D. Good idea. E. I won’t miss it! F. It will last two days G. How much are the tickets? A...
【简答题】根据上下文和你的实际情况把下面的对话补充完整。 Tom: Hi, Betty! Did you go out last weekend? Betty: No. I stayed at home. Tom: 小题1: _____________________? Betty: Because I had lots of things to do. Tom: 小题2: ________________...
【简答题】[填空题] 读下面三段对话,然后选择正确的图片代码回答问题。 1). W: What did you do last weekend? M: Nothing special, I played volleyball in the gym. Q: What did the man do last weekend?____ 2). W: How was your holiday, Tina? M: I...
【单选题】D&M comapny _________ Kamchan Rice International Co., Ltd. about the rice.
A.
made an enquiry for
B.
made an enquire of
C.
enquire with
D.
made an enquiry of
【简答题】A. read B. interesting C. watched D. saw E. like F. prefer A: What did you do during the winter holiday? B: I went skating, watched five films, did sports and ______小题1:...
【单选题】When Secretary of State Condoleezza Rice stood beside Afghan President Hamid Karzai, she made an enlightened statement about cutting Afghanistan' s opium production, saying: 'It is a problem that took...
A.
Opium is closely related with the economy situation of Afghanistan people
B.
It is a hard job which needs time
C.
Afghanistan is not a democratic country
D.
It is a problem left by history and it need more patience
【简答题】创建新的数据库,库名为 my_exercise_db ,然后在该数据库中新建数据表 my_ exercise _table ,表结构如表 12-11 所示。 表 12-11 my_ exercise _table 数据表结构 字段名 数据类型 长度 约束 cid integer 默认 主键、非空、唯一、自增 customer_name character varying 2 无 customer_...
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