搜题请搜索小程序“爱下问搜题”
问题
填空题
若a＞b，则
-
1
2
a
______
-
1
2
b
（用“＞“或“＜“填空）
答案
根据不等式的基本性质3，不等式a＞b的两边同时乘以-
1
2
，得
-
1
2
a
＜
-
1
2
b
．
故答案为：＜．
填空题
看图填空。
1. What is it? It is _____________.
Where is it? It is _____________.
2. What is it? It is _____________.
Where is it? It is _____________.
3. What is it? It is _____________.
Where is it? It is _____________.
4. What are these? They are _____________.
Where are they? They are _____________.
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单项选择题
生活饮用水卫生标准中毒理学指标有
A．氯化物
B．氟化物
C．挥发酚类
D．硫酸盐
E．阴离子合成洗涤剂
查看答案
