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【判断题】
采用PLC后,可以取代 电气控制系统中的主回路和控制回,不再需要这些由低压电器组成的系统了 。A.
正确
B.
错误
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【简答题】在PHP中使用 函数来 执行SQL语句。
【单选题】在滑动轴承摩擦特性实验中可以发现，随着转速的提高，摩擦系数 。
A.
不断增长
B.
不断减小
C.
开始减小，通过临界点进入液体摩擦区后有所增加
D.
开始增大，通过临界点进入液体摩擦区后有所减小
【单选题】水动力角与漂角比较,下列哪项正确?
A.
船舶向正横前运动,水动力角与漂角相等
B.
船舶向正横前运动,水动力角大于漂角
C.
船舶向正横后运动,水动力角大于漂角
D.
船舶向正横后运动,水动力角与漂角相等
【单选题】听力原文：M: Have you ever looked really closely at the snowflake? W: Sure, but they usually melt too fast for me to get a close look. Why do you ask? M: I'm just curious. I was reading an article about th...
A.
Whether or not snowflakes can be analyzed.
B.
How snowflakes are formed.
C.
What causes a snowstorm.
D.
Where the largest snowflakes can be found.
【单选题】听力原文：W: Have you ever looked really closely at the snowflake? M: Sure. But they usually melt too fast for me to get a close look. Why do you ask? W: I'm just curious. I was reading an article about th...
A.
She has never seen snow before.
B.
She is conducting research on snow.
C.
She wants to make artificial snow.
D.
She has been reading about snow.
【简答题】影响幼儿能力发展的因素主要有先天和后天的影响、（）和性格的影响。
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