[单选] In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.

案后回访要求结案后（）个月内进行复查性检查。 1。 2。 3。 4。 外班的受力有哪些？ 由系统原因引起的（）波动是异常波动。 A.产品质量。 B.工艺。 C.设备。 D.浴量波动。 If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）. mile board。 dredging mark。 passing daymark。 crossing daymark。 “艺术起源于劳动”理论的有力提倡者是（）。 马克思。 恩格斯。 列宁。 普列汉诺夫。 In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.