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【单选题】
2019年1月3日,嫦娥四号探测器经历了地月转移、近月制动、环月飞行后,成功着陆在月球背面。设嫦娥四号环月飞行时做匀速圆周运动,已知其到月球中心距离为r,运动周期为T,月球半径为R,引力常量为G.则( )A.
嫦娥四号环月飞行的线速度
B.
月球质量
C.
月球的密度为
D.
月球表面重力加速度
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举一反三
【单选题】what will happen to the cardiac output if the afterload of heart (BP) is increased?
A.
The cardiac output will increase
B.
The cardiac output will decrease
C.
The cardiac output will not decrease until the mean arterial pressure rises above about 160 mmHg.
D.
The cardiac output will never decrease
【单选题】What is the indication of an open in the output of a driving gate?
A.
Only the output of the defective gate is affected.
B.
The affected node will be stuck in the HIGH state.
C.
The affected node will be stuck in the LOW state.
D.
There is a signal loss to all load gates.
【简答题】What the output？（）
【单选题】what will happen to the cardiac output if the afterload of heart (BP) is increased?
A.
The cardiac output will not decrease until the mean arterial pressure rises above about 160 mmHg.
B.
The cardiac output will increase
C.
The cardiac output will decrease
D.
The cardiac output will never decrease
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