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【单选题】
色环电阻的颜色为“红红黑金”,其电阻大小为A.
220Ω，误差为正负5%
B.
22Ω，误差为正负5%
C.
22Ω，误差为正负10%
D.
220Ω，误差为正负10%
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举一反三
【单选题】What is usually used as the frame of skyscrapers?
A.
brick
B.
wood
C.
concrete
D.
steel
【单选题】What is usually used as the nucleus for a cultured pearl?
A.
A fragment of mollusk shell.
B.
A large grain of sand.
C.
A particle of plant material.
D.
A tiny parasite.
【单选题】( ¬ p → q ) → ( ¬ q ∨ p ) 的主析取范式为( )
A.
m 0 ∨ m 2 ∨ m 3
B.
m 0 ∨ m 1 ∨ m 2
C.
m 0 ∨ m 1 ∨ m 3
D.
m 0 ∨ m 1 ∨ m 2 ∨ m 3
【单选题】Since most medium-speed diesel engines are non-reversible, what is usually used to cater for astern thrust?
A.
reversing gear
B.
controllable pitch propeller
C.
fixed-pitch propeller
D.
a clutch
【单选题】Since most medium-speed diesel engines are non-reversible, what is usually used to cater for astern thrust?
A.
A reversing gear.
B.
A controllable pitch propeller.
C.
A fixed pitch propeller.
D.
A clutch.
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