下列物质的转化中,只有加入酸才能一步实现的是( )
A.Zn→ZnSO4
B.Ba(NO3)2 →BaSO4
C.CaCO3→CO2
D.CuO→CuCl2
答案:D
Jack, as well as his friends who ____ football games, ____ traveled with the team.[ ]
A. likes; has
B. like; have
C. like; has
D. likes; have
吴某涉嫌组织卖淫罪被刑事拘留,羁押在看守所。辩护律师赖某在执业活动中知悉的下列线索,可以不告知司法机关是()。
A.发现吴某的委托人史某欲将其邻居打残
B.发现吴某有涉密情报正向境外组织邮寄
C.发现吴某曾实施了故意杀死多人的事实,公安机关尚未掌握
D.发现吴某的同学刘某准备对一商场实施爆炸