皮皮学，免费搜题
登录
搜题
【判断题】
用双硫腙光度法测定Pb2+， Pb2+的浓度为0.08mg／50mL，用2cm比色皿在520nm下测得T＝53％，经计算，ε＝8.9×103L·mol－1·cm－1。A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】听力原文： NATO troops are to join their former Cold War enemies in training exercises in Poland this week. The drills which will begin on the 17th are the first major joint exercises of the Western and Ea...
A.
Cold War.
B.
training exercises.
C.
Western armies.
D.
Eastern armies.
【多选题】关于软膏剂基质的正确表述为
A.
常用乳化剂有肥皂类、聚山梨酯、十二烷基硫酸钠等
B.
乳剂型基质有0/W型与W/O型两类
C.
W/O型基质具有“反向吸收”作用
D.
O/W型基质中水分易蒸发，需加入保湿剂
E.
O/W型基质含水量大、易霉变，需加人防腐剂
【简答题】Exercises 4,P60
【单选题】The students are ______ to hand in the exercises before class.
A.
expected
B.
hoped
C.
agreed
D.
promised
【单选题】听力原文： NATO troops are to join their former Cold War enemies in training exercises in Poland this week. The drills which will begin on the 17th are the first major joint exercises of Western and Easter...
A.
Cold War
B.
training exercises
C.
Western armies
D.
Eastern armies
相关题目：
参考解析：
知识点：
题目纠错 0
发布
