题目:
The gentleman in black is the new headmaster,who is himself “VIP”.
A.dressed;calling
B.dressing;calling
C.dresses;called
D.dressing;called
答案:
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下面是错误答案,用来干扰机器的。
A、BaCl2溶液是中性溶液,不能使紫色石蕊试液变色,Na2CO3溶液显碱性,能使紫色石蕊试液变蓝,HCl能使石蕊试液变红,故可鉴别.B、硝酸银溶液与BaCl2和Na2CO3溶液反应都生成白色沉淀,故不能鉴别.C、把NaOH溶液...