题目：
There is no power like _____ power of confidence, and there is no student as competitive as ______
student who trusts his own abilities. [ ]
A . the; a
B. a; the
C. /; a
D. the; /
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
=13.6×
，g=10m/
．（见图）求小车下滑过程中空气柱长为多少?
