债券按偿还期限可分为()。
A.短期债券
B.中期债券
C.长期债券
D.零息债券
参考答案:A, B, C
一金属块在空气中受到的重力为39N,把它全部浸没水中称时(金属块未接触底面),弹簧测力计读数为34N。(g取10N/kg)。求:
(1)该金属块受到水对它的浮力?
(2)该金属块的体积?
(3)该金属块的密度?
It can be inferred from the passage that a person experiencing acute schizophrenia most likely ______
A.cannot live without medication
B.cannot go on living
C.can hold a full-time job
D.cannot distinguish real from unreal