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【单选题】
以下哪些不是 IG541 气体灭火系统的组成部分A.
氮气
B.
氩气
C.
CO2
D.
氯气
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】实践中提取溶剂选择的一般顺序是什么?
【单选题】— I put on my scarf and hat. Why? — ________________________ [ ]
A.
Because it's hot outside.
B.
Because it's cold outside.
C.
Because I am hot.
D.
Because I am hungry.
【简答题】如图所示,碾轮式混砂机,通过碾轮的碾压、揉搓使不同的砂均匀地混合,用于金属铸造车间制作各种砂芯。
【单选题】- Let's play football on the playground. - It's so hot outside. I prefer_______ at home to_______.
A.
stay; go out
B.
to stay; go out
C.
staying; going out
D.
to stay; going out
【单选题】—Let's play soccer on the playground. —It's very hot outside. I would rather ______ at home than ______ out. [ ]
A.
to stay, go
B.
staying, going
C.
stay, go
D.
stay,to go
【单选题】It’s too hot outside, so we decide ______ out.
A.
going
B.
to go
C.
not going
D.
not to go
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