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【单选题】
下列关于SQL命令的叙述中,正确的是A.
INSERT命令中必须有VALUES关键字
B.
INSERT命令中必须有SET关键字
C.
其他三个说法均不正确
D.
INSERT命令中可以没有INTO关键字
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【单选题】In an open lifeboat，the lifeboat compass is usually（）.
A.
placed in a fixed bracket when being used
B.
clamped to any position convenient for the coxswain to see it
C.
permanently mounted on the lifeboat's centerline
D.
mounted in the center of the boat to eliminate deviation
【简答题】根据液压泵与执行元件的组合方式不同,容积调速回路有四种形式,即( )容积调速回路( )容积调速回路、 定量泵-变量马达 容积调速回路、 变量泵-变量马达 容积调速回路。
【单选题】Each open lifeboat carried on a vessel on an international voyage must have（）.
A.
hand-propelling gear
B.
a davit span with at least 2 lifelines
C.
a mast and a sail
D.
a motor
【单选题】某带权有向图如图3-67所示。 若忽略边上的权，并将其看做AOV网，那么该AOV网的拓扑排序为(1)。若将该图视为AOE网，那么该AOE网的关键路径有(2)条，其长度为(3)。该AOE网的所有关键活动共有(4)个，V5的最早开始时间和最迟开始时间分别是(5)。
A.
V1、V2、V3、V4、V6、V5、V7、V8
B.
V1、V3、V5、V2、V4、V6、V7、V8
C.
V1、V2、V3、V4、V5、V6、V7、V8
D.
V1、V2、V3、V5、V6、V4、V7、V8
【单选题】The Muster List (“Station Bill”) shows each person’s lifeboat station，duties during abandonment，basic instructions，and（）.
A.
all emergency signals
B.
instructions for lowering the lifeboats
C.
the time each weekly drill will be held
D.
work schedule
【简答题】What should be done to make sure that medicines are on board each lifeboat?
【简答题】什么是关键活动AOV网?
【单选题】Frapping lines are fitted to lifeboat davits to ______.
A.
secure the lifeboat in the davits when in the stowed position
B.
bring the life boat close along the rail in the embarkation position
C.
give the occupants a safety line when the boat is being lowered from the embarkation level
D.
reduce the swinging of the lifeboat at the embarkation level
【单选题】Each year the two friends wrote to each other less and less and eventually their friend-ship__________．
A.
fell out
B.
broke off
C.
cut off
D.
held out
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