问题
单项选择题
Fire extinguishers of sizes III，IV，and V are designated as（）.
A.portable
B.semi-portable
C.fixed
D.disposable
答案
参考答案：B
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Fire extinguishers of sizes III，IV，and V are designated as（）.
A.portable
B.semi-portable
C.fixed
D.disposable
参考答案：B