瓶装二氧化碳是不燃、无毒、无腐蚀、压力高于3．5MPa高压液化气

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问题单项选择题

瓶装二氧化碳是不燃、无毒、无腐蚀、压力高于3．5MPa高压液化气体，其气体的数字编码应是（）。

A.0160

B.4110

C.2110

D.0110

答案

参考答案：D

选择题

I go to school five _________ a week. [ ]

A. day

B. dayes

C. days

选择题

--Do you know what caused the accident? --- No, not yet. The matter _____.

A．is being looked into

B．was being looked into

C．looked into

D．is looked into