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【判断题】
晶闸管的导通条件是阳极与阴极之间加正向电压，同时门极与阴极之间加上适当的正向电压，晶闸管一旦导通，门极就失去控制作用。A.
正确
B.
错误
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【单选题】( ) It was raining hard, ________ they had to put off the football match.
A.
however
B.
and
C.
so
D.
but
【单选题】They had to put off their departure ________ the bad weather.
A.
on account of
B.
no less than
【单选题】Because of the heavy rain, they had to put off ______the sports meet.
A.
taking place
B.
to take place
C.
holding
D.
to hold
【单选题】-- They went to the lecture, but it had been put off. -- Oh, so they _____.
A.
needn’t have gone
B.
should have gone
C.
mustn’t have gone
D.
should take it
【简答题】They had to put off the sports meet because of the rain
【简答题】人的一生先后有两组牙发生,第一组牙称___牙,共____有个,第二组牙称___牙,共有__个。
【单选题】As is known________ us, the actress is known________ her excellent acting
A.
for; as
B.
to; for
C.
as; for
D.
to; as
【单选题】Even if almost nothing is known about the neuroanatomy of symboling, a great deal is known about the evolution of mind (or 'minding,' if mind is considered as a process rather than a thing), in which ...
A.
The living things are unable to distinguish the beneficial, the injurious, and the neutral.
B.
It is not necessary for a living thing to come into contact with another thing.
C.
The intrinsic properties of things are the limitations imposed upon the organisms.
D.
The first stage is characterized by the contraction of the pupil under increased stimulation by light.
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