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【简答题】
三个电阻, R 1 =10 W 、 R 2 =20 W , R 3 =30 W 。若三个电阻串联接入电路,则通过三个电阻的电流之比为 ,两端的电压之比为 ;若三个电阻并联,则通过三个电阻的电流之比为 ,两端的电压之比为 .(答案均写成A:B:C的形式,如3:2:1)
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【单选题】I was in some doubt as to whether the detective had__________us accidentally on his way out of the town or if he’d been deliberately tasked.
A.
crashed into
B.
bumped into
C.
fallen against
D.
puzzled about
【单选题】I was in some doubt as to whether the Corporal had______us accidentally on his way out of the town or if he'd been deliberately tasked.
A.
crashed on
B.
bumped into
C.
fallen against
D.
puzzled about
【单选题】I was in some doubt as to whether the Corporal ______ us accidently on his way out of the town or if he'd been deliberately tasked.
A.
crashed on
B.
bumped into
C.
fell against
D.
puzzled about
【单选题】把网络 202 . 112 . 78 . 0 划分为多个子网(子网掩码是 255 . 255 . 255 . 192 ),则各子网中可用的主机的总数是( )。
A.
254
B.
252
C.
128
D.
124
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