染色时固定的作用是什么？
参考答案：
一是杀死菌体，二是使菌体黏附在载玻片上，增加菌体和染料之间的亲和力。
根据对话内容补全所缺单词。
M: Excuse me. Is there a (1)______ in the neighborhood?I am hungry, I want to eat something,
W: Yes, there is.
M: (2)______ can I get there?
W: Go down the street and then walk (3)______ the park. Turn at the first crossing (十字路口).
M: Will I turn left?
W: No, turn (4)______. You can see a big one around a bank.
M: Is it in front of the bank?
W: No. It is behind the bank.
M: Thank you very much.
W: You're (5)______.
单体液压支柱备用量按使用量的（）备足。
A、30％
B、25％
C、20％
