皮皮学，免费搜题
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【单选题】
自动喷水灭火系统的报警阀宜设在明显的地点，且便于操作，距地面高度（ ）。A.
1.2m
B.
1.5m
C.
1.8m
D.
2.0m
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皮皮学刷刷变学霸
举一反三
【简答题】Your duty now is______ (study)．
【简答题】线性方程组有解当且仅当它的系数矩阵的秩与增广矩阵的秩 .
【简答题】Is your son showing his friends the photos now? (用often代替now) _______________________________________________________?
【单选题】I used to _____ a lot, but now I have become fatter, for I mainly stay at home watching TV. [ ]
A.
turn out
B.
work out
C.
help out
D.
take out
【单选题】I turned over the chinese vase by accident while I cleaned the desk and now it is _________.
A.
in turn
B.
in pieces
C.
in ruins
D.
in trouble
【单选题】We have been on duty for four hours and ____. [ ]
A.
now comes your tum
B.
now does your tum come
C.
now your tum comes
D.
comes now your turn
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