皮皮学，免费搜题
登录
搜题
【简答题】
化合物A在薄层板上从样品原点迁移6.9cm,溶剂前沿从样品原点迁移15cm。 (1)计算A的Rf值。 (2)若溶剂前沿移动至样品原点以上17.4cm,A斑点应在此薄层板上何处?
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements is INCORRECT?
A.
Generally speaking, almost all of the clerks get along well with their colleagues.
B.
It's impossible to oppress one's bad temper while being passionate on one's work.
C.
People tend to get angry at work in many situations.
D.
People in companies welcome rage.
【单选题】A: Could you spare a few hours to help me clean the house? B: ______.
A.
No, the house is clean.
B.
Nobody could help you.
C.
No, you should rely on yourself.
D.
I'm really busy with school these days. How does this Saturday sound?
【简答题】运用三段论推理： 复数不可以比较大小，（大前提） 2010和2011都是复数，（小前提） 2010和2011不可以比较大小．（结 论） 该推理是错误的，产生错误的原因是______错误．（填“大前提”或“小前提”）
【单选题】There are many folk cultures on the island, which are_____distinct from the mainland.
A.
clearer
B.
clearly
C.
clearest
D.
cleared
【简答题】Task 2 Construction Clean-up By Jones Cleaning Services Hi! Mike Jones here from Jones Cleaning Services. I see you have a ...
相关题目：