The most powerful signal of stress is a change of pitch on the vowel.()
第1题:
_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angle
A.An external mechanism
B.An internal mechanism
C.An interlock device
D.A hunting gear system
第2题:
Of the following,the most important consideration for a tanker is ______.
A.GM
B.The vertical center of gravity
C.The longitudinal center of gravity
D.The stress on the hull
第3题:
They also warn that these countries are among the most _________ to climate change.
Alax
Bvulnerable
Caddictive
Dnasty
第4题:
第5题:
第6题:
________is the most visible signal of distress from a lifeboat at sea in the daytime.
A.Smoke signal
B.Flash signal
C.Fire signal
D.Radio emergency transmission
第7题:
Most modern Loran-C receivers,when not tracking properly,have a(n)______.
A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station
第8题:
Of the following, the most important consideration for a tank vessel is ______.
A.GM
B.the vertical center of gravity
C.the longitudinal center of gravity
D.the stress on the hull
第9题:
第10题: