在小接地电流系统中，发生单相接地故障时，因（），所以一般允许短时间运行。 不破坏系统电压的对称。 地电流较小造不成危害。 因相电压低对系统造不成危害。
You are working as a Database Administrator. You erroneously dropped an important table named WAREHOUSE_DETAILS. The table resides in a non-SYSTEM tablespace. The following dependent objects have been defined on the dropped table： Due to limited space， some of the indexes and triggers have been removed from the Recycle Bin. You decide to recover the table by using Flashback Drop. You execute the following statement： SQL>FLASHBACK TABLE warehouse_details TO BEFORE DROP； What will be the implication of executing this statement？（） Only the WAREHOUSE_DETAILS table is recovered， and none of the dependent objects are recovered.。 The WAREHOUSE_DETAILS table is recovered along with the NOT NULL constraints， primary key constraint， and the referential integrity constraints.。 The WAREHOUSE_DETAILS table is recovered along with all the dependent objects except the indexes and triggers previously removed from the Recycle Bin.。 The WAREHOUSE_DETAILS table is recovered along with all the dependent objects except the referential integrity constraints and the indexes and triggers previously removed from the Recycle Bin.。
下列不属于压力控制回路是（）。 换向和闭锁回路。 调压和卸载回路。 节流调速主速度换接回路。 顺序动作回路。
生产安全事故发生单位对事故发生负有责任的，发生重大事故的，依法处50万元以上100万元以下的罚款。
（）是反映企业偿付流动负债能力的指标。 资产负债率。 资本产出比率。 流动比率。 速动比率。
幼儿园设备设施管理的主要任务包括（）这几个方面
