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【多选题】
测得某放大电路中三极管 A 、 B 、 C 的对地电位分别为 UA=-9V , UB=-6V , UC=-6.2 V ,试分析 A 、 B 、 C 中哪个是基极 b 、发射极 e 、集电极 c ,并说明是 NPN 管,还是 PNP 管。A.
电位A: 基极b 电位B: 发射极e 电位C: 集电极c 管型：NPN
B.
电位A: 发射极e 电位B:集电极c 电位C: 基极b 管型：NPN
C.
电位A: 发射极e 电位B:基极b 电位C: 集电极c 管型：PNP
D.
电位A: 集电极c 电位B:发射极e 电位C:基极b 管型：PNP
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举一反三
【单选题】According to the conversation which statement about the name of the White House is True?
A.
It became official before President Theodore Roosevelt had it engraved upon his stationery.
B.
It derives the name from the color of the building.
C.
The building was restored after being burned in 1814, so the smoke - stained gray stone walls were painted white.
D.
Actually the cognomen 'White House' was applied to the building some time before it was painte
【单选题】-- Have you moved into the new house? -- Not yet. The rooms _______.
A.
are painting
B.
are being painted
C.
are painted
D.
are being painting
【单选题】Your door needs ___________ . Would you like me to do it for you?
A.
to paint
B.
painting
C.
paint
D.
painted
【单选题】Before__________white, the door should be cleaned thoroughly. [ ]
A.
painting
B.
paint
C.
being painted
D.
having been painted
【单选题】一 Have you moved to your new house? 一 Not yet. My house _____. [ ]
A.
is painting
B.
has been painted
C.
is painted
D.
is being painted
【单选题】—_____she come this afternoon? —No, she can't. Because her mother is ill. [ ]
A.
Can
B.
Would
C.
Could
D.
Will
【简答题】一般情况下,恒速段汽化的水分为( )。
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