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【单选题】
mm420变频器用来设置电动机额定频率的参数是A.
p0308
B.
p0309
C.
p0310
D.
p 0311
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举一反三
【简答题】钻模的主要特点是通过()引导()进行加工
【单选题】What is GMDSS primarily based on?
A.
Ship-to-ship distress communications using MF or HF radiotelephony.
B.
VHF digital selective calling from ship-to-shore.
C.
Distress, urgency and safety communications carried out by the use of narrow-band direct- printing telegraphy.
D.
The linking ofsearch and rescrze authorities ashore with shipping in the immediate vicinity
【单选题】GMDSS is primarily a system based on ______.
A.
VHF digital selective calling from ship to shore
B.
ship-to-ship distress communication using MF or HF radiotelephony
C.
the linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in distress or in need of assistance
D.
distress, urgency and safety communication carried out by the use of narrow-band direct printing telegraphy
【简答题】对M小于0.7的____飞机,机身长细比取6~9,对于M等于0.8~0.9的____飞机,取8~13,而对超声速飞机,则选择为10~23。
【单选题】What is GMDSS primarily based on?
A.
ship-to-ship distress communications using MF or HF radiotelephony
B.
VHF digital selective calling from ship-to-shore.
C.
Distress,urgency and safety communications carried out by the use fo narrow-band direct-printing telegraphy.
D.
The linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in distress or in need of assistance.
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