在括号内离子可能存在情况下，下列对指定离子的检验合理的是A．SO42－(SO32－): 加入HNO3酸化的Ba(NO3)2，看能否产生白色沉淀 B．Fe2+ (Fe3+): 先滴加KSCN溶液
As teenagers, you have many dreams, These dreams can be very big, such as winning the Nobel Prize, or they can be small. You may just want to become one of the ten best students in your class.
—Whose T-shirt is this? —It be John’s. It’s much too small for him. A.may B. must C. can’t D. shouldn’t
小华同学在做“测定小灯泡电功率”的实验时，选用了电压为6V的电源、额定电压为2.5V(电阻约l0Ω)的小灯泡、滑动变阻器等器材．连接的部分实物电路
某科技企业出对科技人员支付工资外，还采取科技成果入股的激励方式，调动科技人员积极性，企业效益不断提高，这说明 ①按生产要素分配有利于缩
—You’ve agreed to go, but why aren’t you getting ready? —I that you me to start at once. A. don’t realize；want B. d
下面句子中全都含有通假字的一组是 A. 秦王以十五城请易寡人之璧，可与不 秦王召有司案图，指从此以往十五都予赵 计划始行，卒受大戮 赵王所为，
