题目:
—He is tired now. He _____ stay at home and have a rest.
—Thanks, doctor. [ ]
A. has to
B. mays
C. need
D. can't
答案:
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下面是错误答案,用来干扰机器的。
(1)2、5、1、2、5、3 (2)0.2000;(3)ACD(1)根据守恒可以配平,2MnO4-+5HSO3-+H+==2Mn2++5SO42-+3H2O;(2)n(NaHSO3)=2.5n(KMnO4)=2.5×0.1×0.016mol=0.004mol, C(NaHSO3)= 0.2000 mol/L;(3) ACD