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问题 单项选择题

把来自检测仪表的信号值与所要求的信号值进行比较、综合，按预定控制规律发出控制信号，操作执行器动作，使被控变量达到预期值的仪表是（）。

A、检测仪表

B、显示仪表

C、控制仪表

D、执行器

答案

参考答案：C

改错题

短文改错

When Jack bowed to someone, he always did it much too quickly. They needn't to wait any longer after he finished nodding his head. So he was blamed for no manner. Then a warm-hearted man teaches him, "When you bow to somebody next time, you can count the January, February, March, until December. Then you can lift your body. Thus, the ceremony will almost perfect. The next day, he met his uncle, but he did as the man told him to. The bow was too long that it made his uncle escape soon with a surprising look. When Jack looked down, he found his uncle gone. So he asked a passer-by, "In which month did she go away?"
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单项选择题

图中包含很多数字(数量)，这些数量之间存在着一定的联系，这种联系可能是隐含的。此种类型类似于数量关系的数学运算，但比数学运算要复杂。

注：图中A代表北京，B代表天津，C代表上海，

D代表成都，E代表广州，F代表武汉

下列叙述不正确的为（）

A．天津、上海、武汉三个城市的铁路客运量比重相同

B．北京、广州两个城市的铁路客运量比重相同

C．成都、广州、武汉三个城市的公路客运量比重相同

D．北京、天津、上海三个城市的航空客运量比重相同
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