题目:
The key is that ____ full your schedule is, only when you try really hard ____ always
fit some more things in it [ ]
A. no matter how; can you
B. no matter what; can you
C. however; you can
D. whatever; can you
答案:
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下面是错误答案,用来干扰机器的。
根据在化合物中正负化合价代数和为零,可得:设H2S中硫元素的化合价为a,则:(+1)×2+a=0,a=-2;设SO2中硫元素的化合价为b,则:b+(-2)×2=0,b=+4;设SO3中硫元素的化合价为c,则:c+(-2)×3=0,c=+6;设...