有两块金属,质量之比是3:2,体积之比是2:1.则它们的密度之比是多少?

题型:问答题

问题:

有两块金属,质量之比是3:2,体积之比是2:1.则它们的密度之比是多少?

考点:密度的计算
题型:问答题

1. Thanks for _________ (选择) such a nice birthday present for me.

2. Listen! You really need to __________(锻炼) more and eat less..

3.Halloween is a special  _____________(节日) in Westen countries.

4.I seldom sit between__________ (they).

5. It’s my ______________(one) time to have a good time on the Great Wall.

6. How many ___________(猴子)are there on the farm?

7. Our English teacher often__________(dress)up in a nice suit when a new term starts.

8. Millie is one of the best ___________ (swim) in our school .

9. My cat is climbing________(穿过) the window to catch the mouse.

10. Eat more vegetables and fruit ,and you can stay ____________(health).

题型:问答题

蛋白质的功能性质主要有()、()、()和()。

题型:问答题

加热炉出口()℃时,装置准备变油。

A、350℃

B、380℃

C、420℃

D、450℃

题型:问答题

可用来制备软胶囊剂的方法是()

A.泛制法

B.滴制法

C.塑制法

D.凝聚法

E.界面缩聚法

题型:问答题

油罐按照安装形式可分为()

A.混凝土油罐

B.地下油罐

C.半地下油罐

D.地上油罐

E.无力矩油罐

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