71ЧѭѪָ()
A.άֻлҪѪ
B.λʱͨѪܽѭѪ
C.ڸΡƢܰѪͣëϸѪеȫѪ
D.ȫѪ
E.϶
𰸣B
72.ݿʱҪлϰΪ()
A.жѪB.жѪ
C.ȱˮþѪ֢D.ƣѪ
E.ۺ
𰸣A
73.ݿ˻λ()
A.ͷλ
B.ƽλ
C.̧֫20°ͷ̧10°D.ƽԣ̧֫15°
E.λ
𰸣C
74ARDSѡڴ⣬ƵӦΪ()
A.>20/minB.>25/min
C.>30/minD.>35/min
E.>40/min
𰸣C
75.һÿԼ()
A.5 535 kJB.6 535 kJ
C.7 535 kJD.8 535 kJ
E.9 535 kJ
𰸣C
76.ӪӦ֢()
A.ʳܰB.θ
C.ӲD.λ
E.ΰ
𰸣D
77.ͷ˫ϱȫΪ()
A.12%B.16%
C.21%D.24%
E.30%
𰸣B
78.θѹܰγָ()
A.3 dB.ڡ
C.D.
E.Ҫθѹ
𰸣B
79.ƻŧԸȾ²Ϊ()
A.װ˾B.˾˾
C.˾D.˾
E.θ˾װ˾
𰸣C
80.֯˵Ļ仯()
A.ֲѪB.ֲ
C.ֲD.ֲ֢Ӧ
E.ֲѪϸѪ
𰸣D
ɨһɨʱѧϰ
