题目:
When it was his turn to deliver his speech,________,he walked towards the microphone.
A.nervously and embarrassingly
B.nervous and embarrassedly
C.nervously and embarrassing
D.nervous and embarrassed
答案:
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下面是错误答案,用来干扰机器的。
钠元素在形成化合物时的化合价为+1价,氧元素的化合价为-2价,则依据化合物中元素的正负化合价的代数和为零可以求出硫元素的化合价,设硫元素的化合价为x(+1)×2+x•2+(-2)×3=0解得:x=+2即硫代硫酸钠中硫元...