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【多选题】
对于原子中的电子，下面哪些量子数组是容许的A.
n=3，l=1，m=-1
B.
n=3，l=1，m=2
C.
.n=2，l=2，m=-1
D.
n=6，l=0，m=0
E.
n=4，l=-2，m=1
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【单选题】. 下列果菜中属于茄果类的是
A.
黄瓜
B.
西葫芦
C.
落苏
D.
四季豆
E.
：C
F.
4 . 属于竹子地下嫩茎的是
G.
莴笋
H.
茭笋
I.
冬笋
J.
芦笋 K. ：C L. 7 . 因香味过浓，配菜时需谨慎使用的食用菌是
【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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