Fill in the blank with the expressions given below. Change the form where necessary. Each expression can be used only once.6. Megan and John realized that their house was too messy for a new baby, so they decided to _____ their house before the baby was born.
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Fill in the blank with the expressions given below. Change the form where necessary. Each expression can be used only once.7. Jennifer couldn't _____ her tears when she saw the sick children at a new blood cancer in Virginia.
Fill in the blank with the expressions given below. Change the form where necessary. Each expression can be used only once.8. We want to give all children a world _____ violence.
在船舶辅锅炉双冲量水位控制系统中,双冲量是指:
A. 水位,给水压差
B. 水位,蒸汽流量
C. 水位,给水流量
D. 给水流量,蒸汽流量
在船舶锅炉水位定值控制系统中,控制对象和被控量分别是_______。
A. 锅炉、水位
B. 锅炉、蒸汽压力
C. 蒸汽压力、水位
D. 给水泵、水位