save network cost
improve the reliability of supplying power to important load
prevent sequence reverse
increase the power factor of important load
第1题：
请将下面程序补充完整。
public class PowerCalc{
public static void main(String[]args){
double x=5.0;
System. out. println(x+"to the power 4 is"+power(x, 4));
System. out. println("7. 5 to the power 5 is"+power(7.5, 5));
System. out. println("7.5 to the power 0 is"+power(7.5, 0));
System. out. println("10 to the power -2 is"+power(10, -2));
}
static double【 】 (double x, int n){
if(n＞1)
return x * power(x, n-1);
else if(n＜0)
return 1.0/power(x, -n);
else
return n==0 ? 1.0:x;
}
}
第2题：
Lubrication for the main reduction gears used with diesel engines is usually supplied by
A.oil from the main engine sump
B.an independent lube oil system
C.the stern bearing head tank
D.the stem bearing sump tank
第3题：
A.Distribution board
B.Section board
C.Emergency switchboard
D.Main switchboard
第4题：
A technician has been asked to ensure a PC is supplied with power for a short time, during apower failure. The technician should install which of the following devices to ensure thisrequirement is easily met?（）
第5题：
A technician has been asked to ensure a PC is supplied with power for a short time, during apower failure. The technician should install which of the following devices to ensure thisrequirement is easily met?（）
A. Backup power generator
B. Uninterruptable power supply
C. Power line conditioners
D. Surge protectors
第6题：
________is supplied with electricity by main switchboard directly not through sub-board on board
A.Deck machinery
B.Little power load
C.Some important load machinery
D.Stationary submersible pump
第7题：
For _______the power is supplied by main switchboard directly not through sub-board
A.saving network cost
B.improving the reliability of supplying power to important load
C.preventing sequence reversing
D.increasing the power Factor of important load
第8题：
以下程序运行后的输出结果是( )。 define Power2(x) x*x main() {int i=6,j=8; printf("%d\n"，Power2(i+j))； }
第9题：
You are on a tanker discharging oil．When all of the oil that the main cargo pumps can handle is pumped out of a tank，the remainder is ______．
A.Stripped out and pumped directly ashore into the mainline as the remaining cargo tanks are pumped out with the main pumps
B.Stripped to one tank and then pumped out with the main pumps
C.Stripped out and pumped directly ashore after all the tanks have been emptied by the main pumps
D.Gravitated to the centers from the wings and pumped out with the main pumps
第10题：
Ammeter and changeover switch
Power factor meter
Synchroscope
Reverse sequence relay