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【单选题】
2009年8月1日，国家发改委有关负责人介绍了上半年中国经济体制改革取得的七大进展。其中，集体林权制度改革全面推进，部分地区启动了森林采伐管理改革试点。我国进行集体林权制度改革，必须遵循生产关系一定要适应生产力发展规律的客观要求，这是因为（）A.
人类社会在本质上是一个客观的物质体系
B.
地理环境.人口因素.生产方式是构成社会物质生活条件的基本要素
C.
人的意识一开始就是社会的产物
D.
人类社会不能离开自然界而存在
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【简答题】Foam is a very effective smothering agent and ______.A. it provides cooling as a secondary effectB. works well on extinguishing electrical firesC. can be used to combat combustible metal firesD. All ...
【单选题】Production of mechanical foam by a portable in-line foam proportioner（）.
A.
increases the size of foam bubbles formed
B.
increases the rate of foam production
C.
improves the extinguishing properties of foam
D.
gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
【简答题】1841 年 1 月,通过非法的《穿鼻草约》,英国侵略者派兵占领了
【单选题】Foam is a very effective smothering agent and ______.
A.
it provides cooling as a secondary effect
B.
works well on extinguishing electrical fires
C.
can be used to combat combustible metal fires
D.
all of the others
【简答题】1841年1月,通过非法的《穿鼻草约》,英国侵略者派兵占领了( )。
【单选题】Why is the plan called 'carrot-and-stick' approach?
A.
Because it is very hard to take effect just like a carrot.
B.
Because it is too strict to student athletes just like a stick.
C.
Because it grants rewards and gives penalties together.
D.
Because it gives up a lot and sticks to some basic rules.
【单选题】One of the limitations of foam as an extinguishing agent is that foam ______.
A.
cannot be made with salt water
B.
is heavier than oil and sinks below its surface
C.
is corrosive and a hazard to fire fighters
D.
conducts electricity
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