皮皮学，免费搜题
登录
搜题
【单选题】
某弱酸 HA 的 Ka= 2.0 ×10 - 5 ,若需配制 pH =5.00 的缓冲溶液,与 100 mL 1.00 mol·L -1 NaA 相混合的 1.00 mol·L -1 HA 的体积约为:A.
50mL
B.
100mL
C.
150mL
D.
200mL
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】In the background was that eternal hum.（ ）
A.
long
B.
never-ending
C.
boring
D.
extensive
【单选题】A continuous watertight bulkhead on a ship may also be a/an ().
A.
structural bulkhead
B.
exterior bulkhead
C.
centerline bulkhead
D.
joiner bulkhead
【单选题】The boys________the newspaper on the ground and began to read the news and articles in it. [ ]
A.
extended
B.
expanded
C.
stretched
D.
spread
【单选题】The word 'monopolize' in the last paragraph means ______.
A.
confine
B.
migrate
C.
control
D.
extend
【简答题】现有关系数据库如下: 数据库名:学生选课数据库 学生表(学号,姓名,性别,年龄,专业) 课程表(课程号,课程名,学分,先行课程号) 选课表(ID, 学号,课程号,分数) 检索有一门或一门以上课程成绩小于60分的所有学生的信息,包括学号、姓名
【单选题】What does the comment 'This is logical' mean?
A.
There is no clear way to determine the extent of our ancestor' s knowledge of plants.
B.
It is not surprising that early humans had a detailed knowledge of plants.
C.
It is reasonable to assume that our ancestors behaved very much like people in preindustrial societies.
D.
Human knowledge of plants is well organized and very detailed.
【单选题】The internal force of a material, which tends to resist deformation when subjected to external forces, is known as _____.
A.
stress
B.
strain
C.
shear strength
D.
ultimate tensile strength
相关题目：
参考解析：
知识点：
题目纠错 0
发布
