生来就有的,对多种病原体都有的防御能力,属于 免疫;出生以后才产生的,只对某一

题型:填空题

问题:

生来就有的,对多种病原体都有的防御能力,属于               免疫;出生以后才产生的,只对某一特定的病原体或异物起作用的防御能力,属于               免疫。

考点:免疫
题型:填空题

阅读理解。

     In the U.S.A. or Canada, on Sundays many people go out for a picnic. They often ask their good

 friends to go with them. They bring many things with them, like glasses, kites, knives, some nice food and

  some nice drink. Sometimes (有时), they take their pets with them. If (如果) it is very fine, they may

 have their food in a park (公园), in a countryside (乡村), or at the foot of (在……脚下) a hill. That's

  great fun.

( ) 1. People in the U.S.A. don't like to go out for a picnic on Sundays.

( ) 2. They often go for a picnic with their good friends.

( ) 3. They don't like to bring pets with them.

(     ) 4. In Canada, only kids have picnics.

(     ) 5. People can't eat in a park in Canada.

题型:填空题

采煤机截割部的完好标准有()。

A、水管接头牢固,截止阀灵活,过滤器不堵塞,水路畅通、不漏水

B、摇臂千斤顶无损伤,不漏油

C、离合器动作灵活可靠

D、摇臂升降灵活,不自动下降

E、齿轮传动无异响,油位适当,在倾斜工作位置,齿轮能带油,轴头不漏油

题型:填空题

下面关于HTML的说法哪个是错误的?()

A、HTML编辑器或文档编辑工具等都可以用来创建HTML文档

B、HTML可以在各种不同的操作系统上使用

C、HTML文档的文件体使用……这对标签,这对标签包含了文档的正式内容

D、HTML是一种描述文档结构的语言

题型:填空题

斜巷内发生事故时信号把钩工如何安全操作?

题型:填空题

冷静型人的缺点有()、不易悔悟、固执。

A.又慢又懒

B.无动于衷

C.冷漠旁观

D.自溢自满

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