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【单选题】
Many unnecessary items went by the way side in the storage room. What is the meaning of the underlined words?A.
to walk on one side of the way
B.
to be discarded（被抛弃）
C.
to be put in the center
D.
to be treasured
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举一反三
【单选题】Each of the following engines has two cylinder heads, except ().
A.
inline engine
B.
V-type engine
C.
W-type engine
D.
boxer engine
【单选题】Each of the following engines has two cylinder heads,except( )
A.
inline
B.
V type
C.
W type
D.
boxer
【单选题】Each cylinder has one starting valve which is usually opened by air pressure and closed by _____.
A.
nuts and bolts
B.
new joints
C.
spring force
D.
sealing rings
【单选题】Each of the following engines has two cylinder heads, except _________.
A.
inline engine
B.
B) V-type engine
C.
W-type engine
D.
boxer engine
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