【简答题】在交流电路中,电流瞬时值随时间变化,因而电弧的温 度、直径以及电弧电压也随时间变化,电弧的这种特性称为 。
【单选题】一旦发现病人意识丧失,心跳呼吸停止,应立即()
【判断题】与超高压相比,特高压系统故障线路的潜供电流及恢复电压更大,潜供电弧持续燃烧时间较长,如不采取适当的限制措施,可能造成重合闸失败,进而影响特高压输电的可靠性。
【判断题】社教服务类节目主持语言的创作一方面,保留生活的实实在在,另一方面,还原表达的生动灵活,富于变化
【判断题】钨极氩弧焊机测试电源恒流特性时,应选择几个电流值进行焊接,并观察电压表、电流表显示的数据来判断电压及电流的变化。
【单选题】Southern Corporation purchased land in 2008 for $380,000. In 2018, it purchased a nearly identical parcel of land for $860,000. In its 2018 balance sheet, Eton valued these two parcels of land at a co...
A.
Principle of the business entity
B.
Going-concern assumption
【单选题】The other man's parcel of land remained barren .
A.
Thousands of years ago the surface was barren desert.
B.
The team will come through this barren patch and start to win again.
C.
She became very depressed during the barren years when she was unable to paint.
【简答题】The other man’s parcel of land remained barren.
【单选题】跳竹竿,又称( ),起源于我国的“京族三岛”。
【判断题】交流电弧的特点是,电弧电压和电弧电流的大小及相位都随时间作周期性变化的,每一周内有两次过零值。