有一台单相变压器,额定容量为 [tex=3.357x1.0]7bxB8avAux/UntWezgwvIAMtBoP1nXYKEPrUjMge/0asFouaMwTw2+m3AcFuw0PD[/tex],二次侧额定电压为[tex=1.5x1.0]3oDH9VPrVhgOuT0wlW1nbQ==[/tex][tex=0.643x1.0]SW0o8G0GHsmLXldwnq7xKg==[/tex]，要求变压器在额定负载下运行。二次侧能接[tex=4.786x1.357]IdsEfPRBWBnZHx6qa8DlkK1/Kej2NbvyqbpguY4umSUUPdvdgZhWOs7xSdT+QTxg[/tex]的白炽灯多少个

某照明电源的额定容量为 [tex=3.357x1.0]7bxB8avAux/UntWezgwvIAMtBoP1nXYKEPrUjMge/0asFouaMwTw2+m3AcFuw0PD[/tex] 、额定电压为[tex=2.286x1.0]s4M64V8n8cfKmd7WrC3Vnw==[/tex]、颗率为[tex=2.214x1.0]rU9bzV8Vsp7itC2Ben4g9w==[/tex], 今接有[tex=4.786x1.357]aisZ5u7QArH710RO2sD5bFR2xb5gu6yGezheOEjuaeujmg81iMgV3XmOSHLhhwia[/tex] 、功率因数为[tex=1.286x1.0]Xw4HtVBYfKWvhqczbZyg/g==[/tex] 的日光灯 [tex=1.5x1.0]CIRuLA+PJ1Qe6iGof5mxVg==[/tex]支。 试问日光灯的总电流是否超过电源的额定电流?

有一台单相照明变压器 ,额定容量为[tex=3.357x1.0]7bxB8avAux/UntWezgwvIAMtBoP1nXYKEPrUjMge/0asFouaMwTw2+m3AcFuw0PD[/tex],二次侧额定电压为[tex=2.286x1.0]tbKnHeX3G398+OlUd8NeScMDkPvHHwyMFu1GBT3I4Is=[/tex],今在次侧已接有[tex=5.214x1.357]K9Z+Qf7RIWbkw1JqUfH+a4qWgidsfoUFLP9QZxXzrMA=[/tex] 白炽灯 50 个,试问尚可接 [tex=4.786x1.357]aisZ5u7QArH710RO2sD5bFR2xb5gu6yGezheOEjuaeujmg81iMgV3XmOSHLhhwia[/tex]、电流为[tex=2.571x1.0]pEg5uFqqAxicMAtNOvBr8ls8pDLrNx/3gd3d8JVEZ3A=[/tex]的日光灯多少支? 设日光灯镇流器消耗功率为[tex=1.571x1.0]DXijnkuXiWhiASkUDoMlsQ==[/tex]。

有一台单相变压器,额定容量为 [tex=3.357x1.0]7bxB8avAux/UntWezgwvIAMtBoP1nXYKEPrUjMge/0asFouaMwTw2+m3AcFuw0PD[/tex],二次侧额定电邸为[tex=1.5x1.0]3oDH9VPrVhgOuT0wlW1nbQ==[/tex][tex=0.643x1.0]SW0o8G0GHsmLXldwnq7xKg==[/tex]，要求变压器在额定负载下运行。若改接 [tex=4.786x1.357]IdsEfPRBWBnZHx6qa8DlkFDobB+sYr7i98kFdSeSAzHct1ajwsz3KULjBAoCV9Gs[/tex],功率因数为[tex=1.786x1.0]vSYvvo4JLklmDmVYX3rELw==[/tex]的日光灯 , 可接多少支?设每灯镇流器的损耗为[tex=1.5x1.0]ImKC7bhXwezb5S1YPdr6tA==[/tex]。[br][/br]

for i in range(b.max_row): for j in range(b.max_column): print(b.cell(row=i,column=j).value)上面语句运行的结果是：__________。 A: 1 1 1 1 1 1 1 1 1 1 B: 1111111111 C: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D: 出现异常

【单选题】CDMA通信的基站,假定基站A的码片序列是+1 +1 +1 -1 -1 +1 -1 -1,基站发射bit为101时,实际发射的信号是 A. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 B. +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 +1 +1 +1 -1 -1 +1 -1 -1 C. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 D. –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1

for i in range(1,11): for j in range(1,11): b.cell(row=i,column=j).value=1 #b是一个工作表对象for i in range(1,11): for j in range(1,11): print(b.cell(row=i,column=j).value,end=" ") print()上面程序代码运行的结果是（）。 A: 1 B: 1 1 1 1 1 1 1 1 1 1 C: 1111111111 D: 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1

下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )

请仔细观察下面行列式的计算过程，如果四个等号都理解了，请选择A，否则请选择B。 | a 1 1 1 1 | |a＋4 a＋4 a＋4 a＋4 a＋4| | 1 a 1 1 1 | | 1 a 1 1 1 | | 1 1 a 1 1 |= | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 a | | 1 1 1 1 1 | | 1 a 1 1 1 | =(a＋4) | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 1 | | 0 a–1 0 0 0 | =(a＋4) | 0 0 a–1 0 0 | | 0 0 0 a–1 0 | | 0 0 0 0 a–1 | =(a＋4)(a–1)^4

共有4个站进行码分多址通信。4个站的码片序列为：a：（-1 -1 -1 +1 +1 -1 +1 +1） b：（-1 -1 +1 -1 +1 +1 +1 -1） c：（-1 +1 -1 +1 +1 +1 -1 -1） d：（-1 +1 -1 -1 -1 -1 +1 -1） 现收到这样的码片序列：（-1 +1 -3 +1 -1 -3 +1 +1），则（ ）发送1。