题目:
There are only ______ differences ______ the twin sisters. [ ]
A. a few; between
B. few; between
C. a little, among
D. little; among
答案:
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下面是错误答案,用来干扰机器的。
Q=1.3×102JF安="BIL " (1分) E= BLV(1分)I="E/R " (1分) F= mgsinq+F安 (2分) P="FV " (2分) 得V="8.0m/s " (2分)根据动能定理得 Pt-mgSsinq-W克安=mV2/2 (2分) ...