JZ-7型空气制动机分配阀具有一次缓解性能时，转换盖板()。
A. 沟通工作风缸与制动管
B. 沟通局减止阀与副阀套
C. 沟通降压风缸与副阀套
D. 无通路
查看答案
下列数据均保留二位有效数字，修约结果错误的是（）。
A. 1.25→1.3
B. 1.35→1.4
C. 1.454→1.46
D. 1.7456→1.7
JZ-7型空气制动机单独制动阀在全制动位后回运转位时，制动缸压力自300kpA降至35kpA的时间为()。
A. 4s
B. 5s
C. ＜4s
D. ＞4s
What equipment is used in or near the survival craft？
A. NAVTEX
B. Fathometer
COSPAS-SARSAT
D. EPIRB
Which is not a functional requirement of GMDSS MF/HF equipment？
A. Radiotelephony on 2152 KHz
B. Transmitting distress signals by DSC on 2187.5 KHz
C. Receiving and Watch keeping by DSC on 2187.5 KHz
D. Transmitting and receiving by NBDP with MF
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