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【单选题】
对于舵机供电线路不论舵机本身还是线路均--过载保护装置。A.
必须放置
B.
单独设置
C.
不设置
D.
A或B
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【单选题】What does the fight against terrorism involve, apart from the use of force in certain instances? ( )
A.
intelligence gathering
B.
financial sanctions
C.
judicial cooperation
D.
all above
【单选题】It took 1.5 seconds for the bicycle to move from A to B. What was the net force acting on the system during this time interval?
A.
N
B.
N
C.
N
D.
N
【简答题】What is the importance of the water potential concept in plant physiology? What are the components of water potential? 2. Define and give an example of osmosis in a plant cell. What is the driving for...
【单选题】What force from the Sun pulls on the Earth and keeps it in orbit?
A.
Gravity
B.
Friction(摩擦力)
C.
Balance
D.
Stress
【单选题】Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them. The 10-kg block accelerates when the string holding the system in compression is cut and the 20-kg bo...
A.
40 N
B.
160 N
C.
(160/3) N
D.
80 N
E.
50 N
F.
60 N
G.
100 N
【简答题】What can be inferred from the passage? The insects need not fear the force of gravity because they are so ______ in weight.
【单选题】An atomic nucleus has a charge of +40e. An electron is m from the nucleus. What is the force on the electron?
A.
2.9 nN
B.
3.7 nN
C.
6.8 nN
D.
9.2 nN
【单选题】A 1200-kg car starts from rest and accelerates with constant acceleration,traveling 200 m in 9.00 s. What is the force of the road on the car during this acceleration?
A.
1.43 kN
B.
3.87 kN
C.
5.93 kN
D.
11.8 kN
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