[单选] The steady state difference between the control point and the value of the controlled variable, corresponding with the set point, is known as （）

对于居民小区的地下车库，一般情况下天线覆盖半径（） 5-10m。 10-15m。 15-20m。 20-25m。 光合作用碳反应中固定CO2的步骤由简称为RubiSCO的酶负责催化进行。RubiSCO的活性受多种因子的调控。有研究显示，叶绿体基质内的氢离子浓度降低与镁离子浓度提升，能促进该酶的活性；此外，在黑暗中，叶肉细胞会持续生成RubiSCO抑制分子，但在光照下，该抑制分子会分解而失去其作用。根据以上材料，下列说法正确的是（） 什么船是化学品船？ At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）. Proceed on present course and speed since the vessel is stopped and making no way through the water。 Keep clear of the vessel because it has a diver down。 Attempt to call the vessel on VHF radiotelephone because someone on board requires medical assistance。 Approach with caution because the vessel is a fishing vessel and its nets are fouled on an obstructio。 什么船是客船？ The steady state difference between the control point and the value of the controlled variable, corresponding with the set point, is known as （）