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【判断题】
当凸轮基圆半径不变时,为了改善机构的受力情况,采用适当的偏置式从动件,可以减小凸轮机构推程的压力角。
A.
正确
B.
错误
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【单选题】设有指针head指向的带表头结点的单链表,现将指针p指向的结点插入表中,使之成为第一个结点,其操作是( )(其中,p->next、head->next分别表示p、head所指结点的链域)。
A.
p->next=head->next ; head->next=p ;
B.
p->next=head->next ; head=p ;
C.
p->next=head ; head=p ;
D.
p->next=head ; p= head ;
【单选题】对乙肝病毒(HBV)的描述,错误的是
A.
Dane颗粒是完整的HBV,直径为42nm
B.
病毒的外衣壳(包膜)由HBsAg镶嵌于脂质双层构成
C.
病毒的内衣壳由HBcAg组成
D.
HBcAg仅存在于感染的肝细胞膜和胞浆内,很难在血清内发现
E.
病毒的核心含有完整双链DNA和DNA多聚酶,在正股5’末端连接一小段RNA,作为合成引物
【单选题】在一个头指针为head的单向链表中,p指向尾结点,要使该链表成为单向循环链表可执行()。
A.
p=head->next;
B.
head->next=p;
C.
head->next=p->next;
D.
p->next=head;
【单选题】Polar orbiting satellite service means a service which is based on___which relay distress alerts form satellite EPIRBS provides their position
A.
near-polar orbiting satellite
B.
.terrestrial satellite
C.
polar orbit
D.
geostationary satellite
【单选题】The low polar orbiting satellite system provides the coverage of____.
A.
sea area A4
B.
sea areas Al and A2
C.
all over the world
D.
sea areas Al, A2, A3 and A4
【单选题】.. means a service which is based on polar orbiting satellites which receive and relay distress alerts from satellite EPIRBs and which provides their position.
A.
Inmarsat service
B.
GPS service
C.
Polar Orbiting satellite service
D.
MSI service
【单选题】( )is a service which is based on polar orbiting satellites which receive and relay distress alerts from satellite EPIRBs and which provides their position
A.
Inmarsat Satellite Service
B.
Polar Orbiting Satellite Service
C.
GPS Satellite Service
D.
NNSS Satellite Service
【单选题】乙肝病毒外衣壳的组成成分是
A.
蛋白质
B.
多糖
C.
核酸
D.
脂类
【单选题】设有指针head指向的带表头结点的单链表,现将指针p指向的结点插入表中,使之成为第一个结点,其操作是______其中p^.next、head^.next分别表示p、head所指结点的链域。
A.
p^.next:=head^.next; head^.next:=p
B.
p^.next:=head^.next; head:=p
C.
p^.next:=head; head:=p
D.
head^.next:=head; p:=head
【单选题】The-low polar orbiting satellite system provides the coverage of _
A.
sea areas Al and A2
B.
sea areas AJ, A2, A3 and A4
C.
sea area A3      .
D.
sea area A4
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