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【单选题】
降压斩波电路中,已知电源电压 U d =12V ,导通比为 1/3 ,则负载电压 U o = 。A.
36V
B.
18V
C.
4V
D.
48V
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【单选题】The interview took place around the kitchen table and was very causal．
A.
formal
B.
informal
C.
regular
D.
irregular
【单选题】In the quest to find a __________ for cancer, scientists must draw on a collective information base.
A.
symptom
B.
diagnosis
C.
cause
D.
remedy
【单选题】It is implied in the passage that______.
A.
local news used to be the only source of information.
B.
local news still takes a significant place.
C.
national news is becoming more popular.
D.
international news is the fastest transmitted news.
【简答题】(Você quer informações). Vou enviar __________ informações.
【单选题】El texto nos informa de que:
A.
todas las hijas de Juan Carlos y su mujer lo ayudan en su trabajo
B.
la pareja reparte los periódicos y las hijas mayores están en el quiosco
C.
su mujer se queda en casa
D.
----
【单选题】对于同一类土，土的可松性系数 Ks 及 K's 相比较，正确的为（ ）。<1< /div>
A.
Ks>K's>1
B.
K's > Ks >1
C.
Ks
D.
K's < Ks
【单选题】Once (giving) (a set of) instructions, a computer can gather (a wide ranger) of informa-tion (for different purposes).
A.
giving
B.
a set of
C.
a wide ranger
D.
for different purposes
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