当用标准流量计检定体积管时，为了防止标准流量计在低流量下滑流_爱下问搜题

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问题单项选择题

当用标准流量计检定体积管时，为了防止标准流量计在低流量下滑流，标准流量计附近阀门应选用（）.

A.快速闭型

B.快速开型

C.快速开闭型

D.方便操作型

答案

参考答案：C

单项选择题

制备人血清蛋白与弗氏完全佐剂的乳化抗原时，两者比例最好为（）

A.1：1

B.2：1

C.3：1

D.4：1

E.0.5：1

填空题

Questions 14-18

·Using the information in the text, complete each sentence 14-18 with an expression from the list below.
·For each sentence (14-18), mark one letter (A-G) on the Answer Sheet.
·Do not mark any letter twice.

A. in emergencies
B. in the face of competition
C. in their own cars
D. in different towns
E. in the minority
F. in the local community
G. in the majority

Currently people shopping at a corner shop are ______.