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【判断题】
isnull方法可以查看是否有缺失值。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】如果企业各项消耗定额或费用定额比较准确、稳定,而且各月末在产品数量变动不大,则该企业适宜采用的完工产品和在产品成本分配方法是( )。
A.
在产品按定额成本计价
B.
约当产量比例法
C.
定额比例法
D.
在产品按其所耗直接材料成本计价
【单选题】The Egyphan boat continued to approach the American ship probably because
A.
the Egyptians thought it was OK to approach military vessels.
B.
the ship was a civilian vessel and caused misunderstanding.
C.
the Egyptians did not understand the words of warning.
D.
no warning flare was fired by the U. S. navy on the ship.
【单选题】听力原文：Do you mind helping me with this form? (A) By about noon, I'd say. (B) I just had some, thank you. (C) Not at all, I'd be glad to. (20)
A.
B.
【简答题】按压力分,阀门可分为: 、 、 、 和 。
【单选题】______ is the offense against navigational rules and will make the ship unseaworthy with the Shipowner responsible for all the consequences．
A.
Overloading
B.
Overtaking
C.
Overboarding
D.
Overlining
【单选题】按照压力分类，阀门可分为真空、低压、中压、高压和超高压阀门，其中低压阀门的压力为（）
A.
公称压力PN<1.6MPa
B.
公称压力PN<2.5—6.4Mpa
C.
PN10.0—80.0Mpa
D.
公称压力PN≥100Mpa
【简答题】按流体压力分类，阀门可分为真空阀、低压门、（）和（）。
【单选题】The permanent dunnage attached to the frames of the ship that aids in ventilation is（are）the ______．
A.
hatch boards
B.
tank top
C.
hatch beams
D.
sweat battens
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