下列做法能改变溶液中溶质质量分数的是[ ] A.将氯化铵的饱和溶_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列做法能改变溶液中溶质质量分数的是[ ]

A.将氯化铵的饱和溶液降温

B.将硝酸钾的饱和溶液升温

C.把氯化钠饱和溶液恒温蒸发

D.在蔗糖的饱和溶液中再加少量蔗糖

答案

答案：A

选择题

I _______ he ________ go there by himself. [ ]

A. think; won't

B. don't think; will

C. don't think; is

D. think; isn't going to

单项选择题

孕妇妊娠多长时间内行手术和麻醉最容易引起新生儿畸形()

A．3个月

B．4个月

C．5个月

D．8个月

E．9个月