转炉炼钢过程中既被氧化又被还原的元素是 A.铁 B.氮 C.氧 D.碳

题型:选择题

问题:

转炉炼钢过程中既被氧化又被还原的元素是

A.铁

B.氮

C.氧

D.碳

考点:质量守恒定律阿伏加德罗定律晶体、非晶体
题型:选择题

地基在同一水平面上,高度相同的两幢楼上分别住着甲、乙两位同学,有一天,甲对乙说:“从我住的这幢楼的底部到你住的那幢楼的顶部的直线距离,等于从你住的那幢楼的底部到我住的这幢楼的顶部的直线距离.”你认为甲的话正确吗?答:______.

题型:选择题

根据句意及首字母提示补全单词。

1. You've got a cold. Take the m_____ three times a day and you will feel better.

2. A hot bath will make you feel r_____ after a hard day's work.

3. The teacher is organizing a d_____ about how to use pocket money.

4. To p_____ children from getting ill, parents should encourage them to do more exercise.

5. Too much work and too little rest often lead to i_____.

6. —Tim, come out to play with us. 

    —Wait a minute! N_____ finished.

题型:选择题

B淋巴细胞表面有以下哪种EBV受体()

A.CD19

B.CD21

C.CD24

D.CD40

E.CD81

题型:选择题

管理幅度与管理层次( )。

A.成正比例

B.成反比例

C.幅度增大就意味着层次增加

D.幅度增大就应该层次增加

题型:选择题

下列对Java源程序结构的叙述中,错误的是

A.import语句必须在所有类定义之前

B.接口定义允许0或多个

C.Java Application中的public class类定义允许0或多个

D.package语句允许0或1个

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