题目内容

FZ型避雷器的电导电流在规定的直流电压下,标准为400~600μA,为什么低于400μA或高于600μA都有问题?

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You are proceeding down a channel and lose the engine(s).You must use the anchors to stop the ship.Which statement is true().

A. Pay out all of the cable before setting up on the brake to insure the anchors dig in and hold
B. For a mud,mud and clay,or sandy bottom pay out a scope of 5 to 7 times the depth before setting up on the brake
C. Use one or both anchors with a scope of twice the depth before setting the brake
Drop the anchor to short stay and hold that scope

病灶呈类圆形,位于鞍内,在MRI的T1加权像上呈等低混合信号,有不规则强化。首先考虑的诊断是()

A. 蛛网膜囊肿
B. Rathke囊肿
C. 胶样囊肿
D. 囊性颅咽管瘤
E. 囊性垂体瘤

用人单位应当自劳动合同签订之日起30日内为其职工向社会保险经办机构申请办理社会保险登记。()

A. 正确
B. 错误

使用CT-1型磁通表测磁钢的磁通量时,把磁钢在()中穿过数次,表针所指的刻度就是测得的磁通量。

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