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【单选题】
If the weather had been better, we could have had a picnic. But it ____ all day.A.
rains
B.
rained
C.
has rained
D.
is raining
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【简答题】20年代初期,新文学倡导者与封建保守派展开激烈论争,其中,林纾创作小说《 》《 》,借以讽刺新文学干将们。
【单选题】Camshafts are usually driven by timing gears or _____.
A.
push rods
B.
chain drives
C.
rocker arms
D.
flywheels
【单选题】By 'a chair rocker on the front perch', the writer refers to a person who ______.
A.
sits on a rocking chair and enjoys life.
B.
is paralyzed and cannot move
C.
has lost the will to struggle against difficulties in life.
D.
never leaves his home.
【单选题】The ________ is a metal rod that fits between the lifter and the rocker arm.
A.
timing gear
B.
cam lobe
C.
push rod
D.
rocker arm
【单选题】The ______ is a metal rod that fits between the lifer and the rocker arm.
A.
timing gear
B.
cam lobe
C.
Push rod
D.
Rocker arm
【单选题】The inventor of the rocker chair may not be able to launch the chair into the market because ______.
A.
he hasn't applied for the patent
B.
he himself can't make many chairs
C.
the rocker in the chair is protected by the patent
D.
the rocker chair has not been proved to be safe
【单选题】Replacing a revolute pair with a sliding pair, a crank-rocker mechanism can be evolved into a ( ).
A.
double crank mechanism
B.
double rocker mechanism
C.
Slider-crank mechanism
D.
guider-bar mechanism
【简答题】英译汉: rocker arm
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