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【单选题】
下列关于计算机病毒的4条叙述中,有错误的一条是A.
计算机病毒是一个标记或命令
B.
计算机病毒是人为制造的一种程序
C.
计算机病毒是一种通过磁盘、网络等媒介传播、扩散，并能感染其他程序的程序
D.
计算机病毒是能够实现自身复制，并借助一定的媒介存在的具有潜伏性、传染性和破坏性的程序
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【单选题】If no gaskets are used in the piping joints of a Freon system, the joints must be（）
A.
finished joints
B.
welded joints
C.
ground joints
D.
soldered joints
【单选题】According to the article, why should building joints be agile?
A.
Such joints are cheap.
B.
Such joints make buildings flexible and moveable.
C.
Such joints are concrete frames.
D.
Such joints make the buildings rigid.
【单选题】U-joints in the shaft accommodate any angular variations between the steering shaft and the______ .
A.
reservoir
B.
drag link
C.
pitman arm
D.
steering gear input shaft
【单选题】In usual marine applications, bellows joints are designed and fitted to accommodate straight line axial movement only and the associated piping requires adequate anchors and guides to pr misalign...
A.
The marine bellows joints are attached in the accommodation only
B.
The bellows joints should be attached to anchors
C.
The associated piping should be thrown into the water like as anchors
D.
The connecting piping with the joints should be fixed firmly
【多选题】Which belong to the joints of the vertebral arch ( )
A.
Linta flava
B.
Interspinal lints
C.
Intertransverse lints
D.
Intervertebral disc
E.
Zygapophysial joints
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