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【简答题】
在一棵度为3的，度为3的节点个数为2，度为2的节点个数为1，则度为0的节点个数为_______ 。 A．4 B．5 C．6 D．7 A． B． C． D．
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反馈参考答案：
举一反三
【单选题】Upon completion of fueling a gasoline driven vessel it is necessary to ______.
A.
keep ports，doors，windows，and hatches closed
B.
start engines immediately
C.
ventilate before starting engine
D.
None of the above
【单选题】Fueling results in the collection of waste oil in drip pans and containers. Which is an approved method of disposing of the waste oil?
A.
Draining it overboard when the vessel gets underway
B.
Placing it in proper disposal facilities
C.
Adding sinking agents and discharging it into the water
D.
Mixing it with dispersants before draining it overboard
【单选题】Which statement is FALSE concerning precautions during fueling operations?（）
A.
All engines，motors，fans，etc. should be shut down when fueling
B.
All windows，doors，hatches，etc. should be closed
C.
A fire extinguisher should be kept nearby
D.
Fuel tanks should be topped off with no room for expansion
【单选题】关于强直性脊柱炎(AS)的论述，错误的是
A.
多见于青少年
B.
以中轴关节的慢性炎症为主
C.
不可能累及内脏及其他组织
D.
X线片表现骶髂关节明显破坏或脊柱呈'竹节样'变化
E.
HLA-B27的阳性率为90%.
【单选题】In the United States, the fueling stations offering for filling natural gas have reached to ______.
A.
1,300
B.
500
C.
1,500
D.
2,500
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