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【判断题】
PLC的工作方式是采用周期循环扫面，其优点是集中输入与集中输出，能在很大程度上减少软故障的发生。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】听力原文：W: You took an optional course this semester, didn't you? How is it going? M: Terrible! It seems like the more the professor talks, the less I understand. How did the man feel about the course?
A.
He wishes to have more courses like it.
B.
He finds it hard to follow the teacher.
C.
He wishes the teacher would talk more.
D.
He doesn't like the teacher's accent.
【单选题】美国的经济学家权威密契尔说:“......近代的观点认为经济危机只不过是'商业周期'反复出现的一个特点......”导致“商业周期”反复出现的根本原因是( )
A.
资本主义制度的基本矛盾
B.
分期付款造成市场虚假繁荣
C.
资本家盲目扩大生产
D.
自由放任的经济政策
【单选题】听力原文：W: You took an optional course this semester, didn't you? How is it going? M: Terrible. It seems like the more the professor talks, the less I understand. Q: How does the man feel about the cours...
A.
He wishes to have more courses tike it.
B.
He finds it hard to follow the teacher.
C.
He wishes the teacher would talk more.
D.
He doesn't like the teacher's accent.
【判断题】Thinking Cap Corp. prices its various cap designs at different price levels, ranging from $2.05 to $5.95. This is an example of optional product pricing.
A.
正确
B.
错误
【简答题】大肠杆菌在多种碳源同时存在的条件下，优先利用乳糖。
【单选题】以下说法错误的是( )。
A.
使用 DECLARE CURSOR 语句声明游标
B.
关闭游标之后，游标不再占用系统资源
C.
使用 OPEN 语句打开游标
D.
使用 CLOSE 语句关闭游标
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