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【单选题】
Read this extract:The largest known eagle ever documented, this fearsome creature weighedup to fifteen kilograms and sported wings spanning two to three metres indiameter. Although this wingspan is comparatively small (the WanderingAlbatross and Andean Condor, for instance, each have wing spans inexcess of three metres), the Haast’s eagle possessed a much larger bodymass to wing ratio. While stubbier wings made the eagle ill-suited toprolonged flight, they did enable the Haast’s eagle to nimbly and swiftlymanoeuvre its large frame around trees, which would have been vital forpursuing prey through New Zealand’s dense forest and scrubland. The most impressive aspect of the bird’s anatomy, however, was its enormoustalons. At almost 23 centimetres in length, these are comparable to those ofsome wild cats and have justifiably earned the Haast’s eagle the nickname‘Tiger of the Skies’.Which of the following is NOT true?
A.
The Haast’s eagle could only fly for short distances.
B.
The Haast’s eagle was adapted to flying through forests.
C.
The Haast’s eagle’s wings were shorter than other large birds.
D.
The Haast’s eagle had small but very efficient claws.
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【多选题】生命的特性包括()
A.
向上性
B.
唯一性
C.
无限性
D.
独特性
【多选题】生命的特性包括( )
A.
生命的神圣性
B.
生命的独特性
C.
生命的完整性
D.
生命的自主性
E.
生命的超越性
【多选题】生命的特性包括( )
A.
非逆转性
B.
非再生性
C.
非置换性
D.
非创造性
【单选题】Please telephone me half an hour _______.
A.
in charge
B.
in advance
C.
in time
D.
in front
【单选题】RLC串联电路中,电阻、电感和电容电压有效值分别为30V 、60V 、20V ,则端口电压U为 ( )。
A.
10V
B.
50V
C.
90V
D.
150V
【多选题】在RLC串联谐振的交流电路中,
A.
阻抗最小
B.
电容电压和电感电压大小相等,相位相反
C.
无功功率为零
D.
有功功率为零
E.
电流最大
【单选题】If you need more information, please contact us______telephone or email.
A.
in
B.
by
C.
on
D.
for
【单选题】Could you please _______ us Tom's telephone number? [     ]
A.
tell
B.
to tell
C.
telling
D.
tells
【简答题】在 RLC 串联电路中,已知电路两端电压 V,电阻 , 电感 L=445mH ,电容 C=32 μ F ,求: ( 1 )、判断该电路的性质; ( 2)、 求电路中的电流 I 、 i; (3)、 求各元件两端的电压有效值; ( 4 )、作出电路的端电压和电流的相量图(提示:tan53.1°=1.333 )
【单选题】RLC串联电路中,阻抗三角形中,三条边分别是
A.
阻抗、电抗、电阻
B.
有功功率、无功功率、视在功率
C.
电阻电压、电容电压、电感电压
D.
电源电压、电阻电压、电容和电感电压
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