问题
多项选择题
关于石蜡切片，下列说法正确的有（）
A.组织块经固定、脱水处理后，浸蜡包埋
B.4℃保存备用
C.切片厚度为2～3μm
D.是观察组织细胞结构的理想方法
E.可长期保存
答案
参考答案：A, B, C, D, E
搜题请搜索小程序“爱下问搜题”
关于石蜡切片，下列说法正确的有（）
A.组织块经固定、脱水处理后，浸蜡包埋
B.4℃保存备用
C.切片厚度为2～3μm
D.是观察组织细胞结构的理想方法
E.可长期保存
参考答案：A, B, C, D, E
| 完形填空。 | ||||
| A high school history teacher once told me, "If you make one close friend in school, you will be the most fortunate. A true friend is someone who stays with you for life." 1 teaches that he was right. Good friendship is just not easily 2 . It is possible that we simply do not stay in one place long enough for a 3 friendship to 4 . However, there can be 5 disagreement on the need for each of us to think carefully about the kind of friendship we want. To most of us, friendships are considered very important, but we need to be clear in our 6 the kinds of friendship we want. Are they to be close or _ 7 at arm's length? Do we want to 8 ourselves or do we want to walk on the surface? For some people , many friendships on the surface are 9 enough- and that's all right. But on some points, we need to 10 that our expectations are the same as our friends' expectations. The sharing 11 experience 12 our tears as well as our dark dreams is the surest way to deepen friendships. But it 13 be undertaken slowly and carried on only if there are 14 of interest and action in return. What are some of the 15 of friendship? The greatest is the attraction to expect too much time or too soon. Deep relationships 16 time. Another "major difficulty" is the selfishness to think one "possesses" the other, including his time and attention. Similarly, friendships 17 actions in return . In 18 words, you must give as much as you take. Finally there is a question of taking care of . Unless you spend 19 time together , talking on the phone, writing letters, doing things together, friendships will die 20 . | ||||
|