燃气管道严密性试验,当设计输气压力P<5kPa时,试验压力应为( )。A.25kPa B.20kPa C.15kPa D.10kPa
粉尘爆炸产生的最大爆炸压力为()。(A)300kPa(B)345kPa(C)450kPa(D)700kPa[98%]
粉尘爆炸产生的最大爆炸压力为()。(A)300kPa(B)345kPa(C)450kPa(D)700kPa
A.291.6kPa
B.353.8kPa
C.376.9kPa
D.402.7kPa[98%]
A.291.6kPa
B.353.8kPa
C.376.9kPa
D.402.7kPa
A.460~480kPa
B.560~580kPa
C.270~280kPa
D.350~360kPa[98%]
A.460~480kPa
B.560~580kPa
C.270~280kPa
D.350~360kPa
A.58.2kPa
B.68.2kPa
C.78.2kPa
D.88.2kPa[98%]
A.58.2kPa
B.68.2kPa
C.78.2kPa
D.88.2kPa
A.58.2kPa
B.68.2kPa
C.78.2kPa
D.88.2kPa[98%]
A.58.2kPa
B.68.2kPa
C.78.2kPa
D.88.2kPa
A.205.2kPa
B.208.0kPa
C.215.2kPa
D.218.0kPa[98%]
A.205.2kPa
B.208.0kPa
C.215.2kPa
D.218.0kPa
A.205.2kPa
B.208.0kPa
C.215.2kPa
D.218.0kPa[98%]
A.205.2kPa
B.208.0kPa
C.215.2kPa
D.218.0kPa
...应小于( )。A.40kPa B.45kPa C.50kPa D.55kPa E.60kPa[98%]
患儿,5岁,重度肺炎,需用电动吸引器为他吸痰,负压选择应小于( )。A.40kPa B.45kPa C.50kPa D.55kPa E.60kPa
...应小于( )。A.40kPa B.45kPa C.50kPa D.55kPa E.60kPa[98%]
患儿,5岁,重度肺炎,需用电动吸引器为他吸痰,负压选择应小于( )。A.40kPa B.45kPa C.50kPa D.55kPa E.60kPa