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[单选] What is a characteristic of all centrifugal cargo pumps? ()

A . They are self-priming
B . Decreasing the speed of rotation will decrease the discharge pressure
C . Opening the discharge valve wider will increase the discharge pressure
D . All of the above

各单位建立监管员定期岗位轮换的制度,监管人员一般要求异地()个月、本地一个月必须轮换。 一。 二。 三。 四。 Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?() The viscosity off the fuel。 The quantity of water to be removed from the fuel。 The specific gravity of the fuel。 The quantity of dirt to be removed from the fuel。 Windows XP为用户提供了良好的()。 命令行式单任务操作界面。 键命令式多任务操作界面。 图形化单任务操作界面。 图形化多任务操作界面。 ()是科医学非常重要的原则,也是全科医学区别于其他二级临床医学专科的重要特征。 连续性照顾。 人格化的照顾。 综合性照顾。 协调性照顾。 If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the() oil has a tendency to emulsify in the bowl。 purifier will act as a clarifier at the discharge ring。 oil will be lost through the water discharge ports。 oil solids will be deposited only at the intermediate top disk。 What is a characteristic of all centrifugal cargo pumps? ()
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