有毒气体检测仪的制造厂家和型号规格有哪些？_爱下问搜题

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问题问答题简答题

有毒气体检测仪的制造厂家和型号规格有哪些？

答案

参考答案：

有北京科力恒公司：SP-2104（CO），日本理研公司GP-571型，美国Zsieger－5070

选择题

They were all pleased with ______ to them.

A. what you said
B. what did you say
C. what you had spoken
D. when you had told

填空题

80%婴幼儿腹泻由病毒感染引起，以（）引起的秋冬季腹泻最为常见。