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【判断题】
踏板力或踏板行程越大,制动效果越明显。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Chartered companies were NOT granted the ______ by the British King or Queen.
A.
economic rights
B.
political authority
C.
judicial authority
D.
diplomatic authority
【单选题】A grindstone increases in angular speed from 4.00 rad/s to 12.00 rad/s in 4.00 s. Through what angle does it turn during that time interval if the angular acceleration is constant?
A.
8.00 rad
B.
12.0 rad
C.
16.0 rad
D.
32.0 rad
【多选题】关于 REVOKE 语句,下列说法中正确的包括( )。
A.
一条 REVOKE 语句可同时回收多个用户的多个权限
B.
一条 REVOKE 语句只能回收一个用户的一个权限
C.
若指定 RESTRICT, 则不能回收已转授的权限
D.
若指定 CASCADE, 则同时回收所有已转授的权限
【单选题】The gravitational force exerted by the Sun on the Earth holds the Earth in an orbit around the Sun. Let us assume that the orbit is perfectly circular. The work done by this gravitational force during...
A.
zero
B.
positive
C.
negative
D.
impossible to determine
【单选题】A grindstone increases in angular speed from 4.00 rad/s to 12.00 rad/s in 4.00 s. Through what angle does it turn during that time interval if the angular acceleration is constant?
A.
8.00 rad
B.
12.00 rad
C.
16.0 rad
D.
32 .0 rad
【单选题】The time interval between two adjacent spikes in the nerve fiber should be at least greater than
A.
Relative refractory period
B.
Absolute refractory period
C.
Supernormal period
D.
Absolute refractory period plus relative refractory period
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