Owing to the greater girth of a ship amidships than at the ends, certain strakes are dropped as they approach the bow and stern to reduce the amount of plating at the ends. These strakes are called ______.
A.drop strakes
B.stealers
C.throughs
D.Voids
第1题:
Course ___(复原)!
A.on port
B.on starboard
C.again
D.amidships
第2题:
前缀列表{ip ip-prefix}的命令格式为 ip ip-prefix ip-prefix-name[index index-number]{permit|deny}ipv4-address mask-length[greater-equal greater-equal-value][less-equal less-equal-value],如果仅指定了greater-equal未指定less-equal,则前缀范围为()
A.[0,greater-equal-value]
B.[mask-length.greater-equal-value]
C.[greater-equal-value,32]
D.无限制
第3题:
A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the ______.
A.distress position
B.spoken words “Mayday, Mayday, Mayday”
C.ship’s name
D.ship’s call letters
第4题:
A.train
B.bus
C.car
D.ship
第5题:
“AMIDSHIPS ” refers to______.
A.Back of the vessel
B.The middle portion of a ship
C.A backward movement of a vessel
D.Across the ship, at right angles to the fore-and-aft centerline
第6题:
要查看stats包中的数据集trees的某一列数据,比如仅查看Girth列的命令是
A.trees$Girth
B.trees[Girth]
C.trees(Girth)
D.trees.Girth