更多"There shall be two principal （） thr"的相关试题:
[单项选择]There shall be two principal（）through the harbor for the passage of vessels of over 60 tons burden.
A. straits
B. channels
C. canals
D. roadsteads
[单项选择]All fog signals shall be sounded every two minutes with the exception of a vessel（）.
A. underway or making way
B. under sail or under tow
C. anchored or aground
D. not under command or restricted in her ability to maneuver
[单项选择]I've got two tickets for the match. Shall we go and watch it together? （）
A. The tickets must be expensive
B. The match must be exciting.
C. Why not. Let‘s go.
D. The place is too far away.
[单项选择]Which two components pass through the shank of an LWT anchor?（）
A. Anchor shackle and stock
B. Tripping palm and flukes
C. Crown and chocks
D. Swivel and stabilizer bar
[多项选择]Two switches are connected through a trunk link.which two commands show that there is a native VLAN mismatch on that link?（）
A. show interfaces interface
B. show vlan bri
C. show interfaces interface switchport
D. show interface interface trunk
E. show interfaces vlan
[单项选择]The two countries solved their border（）through negotiations.
A. debate
B. dispute
C. argument
D. quarrel
[单项选择]A frame with two，or sometimes four，arms through which are threaded the guidelines and which is used to keep the drill stem and bit in line with the center opening in the temporary guide base is the（）.
A. drill stem guide
B. guide frame
C. drill string frame
D. casing guide
[单项选择]（） shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply.
A. Cooling system
B. Alarm system
C. The air conditioning installation
D. The mooring equipment
[单项选择]Point Judith Harbor of Refuge（）.
A. is used mostly by towing vessels
B. has a maximum depth of 14 feet (4.3 meters) at MHW
C. West Gap has a controlling depth of 24 feet
D. is entered through the East Gap or the West Gap
[单项选择]The principal purpose of magnetic compass adjustment is to（）.
A. reduce the variation as much as possible
B. reduce the deviation as much as possible
C. reduce the magnetic dip as much as possible
D. allow the compass bowl to swing freely on its gimbals
[单项选择]The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A. direction of air flow within the cylinder
B. sequence of port opening
C. method of opening exhaust ports
D. volume of air admitted to the cylinder
[单项选择]The ladder shall（）.
A. be secured in a position so that it rests firmly against the ship's side from which the discharge operations are carried out
B. have at least two replacement steps which are secured in position by a method different from that used in the original construction
C. have battens made of hardwood，or other material of equivalent properties，in one piece and not less than 1.80metres long provided at such intervals as will prevent the pilot ladder from twisting
D. have steps made of softwood，or other material of equivalent properties，made in one piece free of knots，having an efficient slip surface
[单项选择]The principal personnel hazard unique to Halon extinguishers is（）.
A. displacement of oxygen
B. skin irritation
C. inhaling toxic vapors
D. eye irritation
[单项选择]The principal advantage of NAVTEX radio warnings is that（）.
A. they can be used by mariners who do not know Morse code
B. only an ordinary FM radio is necessary to receive these warnings
C. information on a given topic is only broadcast at specified times
D. they cover a broad spectrum of the radio band allowing reception on almost any type of receiver
[单项选择]One of the principal dangers inherent in liquefied petroleum gas is（）.
A. as it warms up it becomes heavier than air
B. the way it reacts with sea water
C. the strong odor it produces
D. its low temperature causes frostbite or freezing
[单项选择]The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A. variation
B. compass error
C. deviation
D. earth's magnetic force
