机械制图上标有φ40+0.04,表示()为零。

题型:填空题

问题:

机械制图上标有φ40+0.04,表示()为零。

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题型:填空题
已知cotx=
a2-1
2a
,其中0<a<1,x∈(0,π),则cosx的值是(  )
A.
2a
a2+1
B.
1-a2
1+a2
C.
a2-1
a2+1
D.±
a2-1
a2+1
题型:填空题

抗原性漂移是指()

A.禽流感病毒由鸡传给人

B.猪流感病毒由人传给猪

C.雪貂感染人流感病毒

D.表达血凝素和神经氨酸酶的基因片段发生点突变,使抗原性发生量变

E.表达血凝素和神经氨酸酶的基因片段发生大幅度突变,形成新毒株

题型:填空题

Directions: Complete the following passage by filling in each blank with one word that best fits the context.

Our school is quite famous for its long history. It was founded in the early 1907s. It is a good place   1  we can prepare ourselves well for the future. We have many wonderful teachers   2  are always ready to offer help.  3   we pay a lot of attention to how well we do in lessons, achieving high scores is not the only reason to study. The teachers encourage us to try   4 new ideas and ask questions. With their help we have developed all kinds of interests  5 both Arts and Science. We can choose to join any school clubs they are interested in. We can  6 choose the subjects that we want to study. Last term I selected American literature   7 I wanted to learn about famous American writers. This term I chose to attend music classes because my father bought me a piano as   8  birthday present.

题型:填空题

An Intranet is (71) the application of Internet technology within an internal or closed user group.Internets are company (72) and do not have a (73) connection to the Internet.Used properly an Internet is highly effective corporate tool,capable of regularly (74) information to empower the workforce with the information needed to perform their roles.Used in this way,Internet represent a step towards the (75) office.

74()

A.update

B.updated

C.updates

D.updating

题型:填空题

“应交营业税”科目的借方登记()

A.应交的营业税

B.已交的营业税

C.欠交的营业税

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