挤压的强度条件是（）。A.σjy≤[σ] B.σ

钩端螺旋体病的主要传染源是（）

A.猪

B.老鼠

C.患者

D.兔子

E.犬

孙中山“三民主义”内容不包括

A．民主

B．民族

C．民权

D．民生

某公司每年都要对企业的销售人员进行培训，主要是聘请名教授来讲授一些市场营销的理论知识。由于缺乏实际案例的讲解和员工的参与，员工普遍认为这种培训没有考虑他们的需求，既浪费时间又没有效果。另外，培训结束以后，就再没有人过问培训的事情了。根据以上资料，回答下列问题：

该公司在培训中采用讲授法的缺点是（）。

A.受训人员不能主动参与培训开发

B.耗费太多的时间和经费

C.只能从讲授者的演讲中被动地吸收

D.不能同时对学员实施集体培训开发

阅读理解

     A volcanic eruption in Iceland has sent ash across northern Europe. Airlines have stopped or changed

the flights across the Atlantic Ocean, leaving hundreds of passengers stuck in airports.

     Grimsvom is one of the largest and most active volcanoes in Europe. What makes Grimsvom different

is that it lies under a huge glacier(冰川) of ice up to 12 meters thick. The hot volcano heats up the ice

above it, which then forms a layer(层)of water between the glacier and the volcano.This layer of water

puts pressure on the volcano, keeping it stable. As the water flows out from under the glacier, the pressure lifts. The lava(岩浆) from the volcano then comes up to the surface. This is exactly what happened today.

     Now, airlines have to make changes to their flights so as not to fly through the clouds of volcanic ash.

According to KLM,one of Europe's biggest airlines, airplanes cannot go under the cloud or over it. Going

through the cloud can result in ash getting stuck in the airplane's engines, causing damage to the plane.

     The eruption has also caused problems for animals in Iceland. The volcano left ash and sharp glasslike

rocks all over the countryside. Farmers are keeping their animals inside to stop them from eating

ashcovered grass or the sharp object.

1．What makes Grimsvom different from other volcanoes?  

A．It is below ice.

B．It lies under the sea.

C．It is the largest volcano.

D．Its lava affects the airlines.  

2．What keeps Grimsvom still?  

A．The slow flow of water.

B．The low water temperature.  

C．The thick glacier.

D．The water pressure.  

3．Which of the following is the result of the volcanic eruption?

A．People stop traveling in Europe.

B．Airlines suffer from the loss of planes.  

C．It becomes dangerous for animals to eat outside.

D．Farmers have lost many of their animals.  

4．This text is most probably taken from________.

A．a research paper  

B．a newspaper report

C．a class presentation  

D．a geography textbook

磨煤机大修后，应联系检修人员进行（）工作，合格后磨煤机方可（）。