皮皮学，免费搜题
登录
搜题
【单选题】
当层析系统为正丁醇 ∶ 冰醋酸 ∶ 水 =4 ∶ 1 ∶ 5 时,用纸层析法分离 Leu ( L )、丙氨酸( A )和苏氨酸( T )它们的 R f 值之间关系:A.
L ＞ A ＞ T
B.
L ＞ T ＞ A
C.
A ＞ L ＞ T
D.
T ＞ A ＞ L
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
【简答题】We would like to inform. you that at present we can supply you with various kinds of men's leather shoes.(英译中)
【判断题】We would like to inform. you of at present we can supply you ( )various kinds of men&We would like to inform. you of at present we can supply you ( )various kinds of men's leather shoes.()
A.
正确
B.
错误
【简答题】Because ________ you must continually replenish the supply of calcium.
【单选题】十九大报告指出，坚决打赢脱贫攻坚战，确保到()年我国现行标准下农村贫困人口实现脱贫，贫困县全部摘帽，解决区域性整体贫困，做到脱真贫、真脱贫。
A.
二〇三五
B.
二〇三〇
C.
二〇二五
D.
二〇二〇
【单选题】They will _____ you everything you need once you start your scientific research. [ ]
A.
supply
B.
provide
C.
take
D.
offer
【简答题】We would like to inform you that ______ present we can supply you ______ various kinds of men's leather shoes.
相关题目：