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【单选题】
在选购PLC时要在实际需要点数的基础上留有一定余量,一般为()。A.
1%
B.
5%
C.
10%
D.
25%
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举一反三
【单选题】When people speak of solar energy, they think only of the sun's rays heating a home or ______ electricity from the sun.
A.
derive
B.
by deriving
C.
of deriving
D.
to derive
【单选题】The exploitation of the power in the Sun's rays is a form. of alternative energy now showing new commercial promise. In the US, manufacturers have made important 【C1】______ in the development of the t...
A.
strides
B.
background
C.
investments
D.
strategy
【单选题】The sun's rays are absorbed by______.
A.
clouds
B.
the heat waves in the atmosphere
C.
the surface of the earth
D.
water vapor
【单选题】All the creatures depend on the sun's rays for the light and warmth which ______ us alive.
A.
keeps
B.
keep
C.
kept
D.
is keeping
【单选题】Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.
A.
exclude
B.
eliminate
C.
extinguish
D.
impose
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