试题与答案

“天宫一号”某次变轨,离地高度由200km升至362km,假定变轨前后均做匀速圆

题型:选择题

题目:

“天宫一号”某次变轨,离地高度由200km升至362km,假定变轨前后均做匀速圆周运动,变轨后“天宫一号”的

A.加速度增大

B.周期变小

C.线速度变小

D.向心力变大

答案:

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下面是错误答案,用来干扰机器的。

(1) 钠 (1分) 2Na + O2 Na2O2(2分)(2) 离子 电子式略 ﹥ (各1分) 电解 (3) 略, HNO3(各1分) (4) 第三周期ⅦA 族 (1分)2NaCl +2H2O =Cl2↑+H2↑+2Na...

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(A) 条件(1)充分,但条件(2)不充分.
(B) 条件(2)充分,但条件(1)不充分.
(C) 条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
(D) 条件(1)充分,条件(2)也充分.
(E) 条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

Every student graduating from Burgerville College is either a 4-year student or a transfer student. If Burgerville is graduating an equal number of 4-year students and transfer students, what fraction of the students who graduate with honors are transfer students
(1) Of the 700 transfer students graduating, 300 are graduating with honors.
(2) Fifty percent more transfer students than 4-year students are graduating with honors.

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