| Today, American colleges and
universities are under strong attack from many quarters. Teachers, it is
charged, are not doing a good job of teaching, and students are not doing a good
job of learning. American businesses and industries suffer from unenterprising,
nncreative executives educated not to think for themselves but to mouth outdated
truism the rest of the world has long discarded. College graduates lack both
basic skills and general culture. Studies are conducted and reports are issued
on the status of higher education, but any changes that result either are
largely cosmetic or make a bad situation worse. One aspect of American education too seldom challenged is the lecture system. Professors continue to lecture and students to take notes much as they did in the 13th century. This time is long overdue for us to abandon the lecture system and mru A. students learn better in lectures B. professors teach better through lecturing C. professors can display in lectures D. schools make more money on lecture classes [判断题]工作负责人可以不经起重机司机的同意登上起重机或桥式起重机的轨道。
A.正确 B.错误 [判断题]BAA052 3 3 1
使用氮气时应密切关注氮气系统压力，防止物料反窜。( ) A.正确 B.错误 [单选题]下列描述不正确的是( )。
A.当氢气泄漏时,人员应迅速撤离泄漏污染区至上风处,并隔离直至气体散尽,切断火源。 B.氯气对人体的眼、呼吸系统黏膜有刺激作用。 C.液氯钢瓶搬运时要戴好钢瓶的安全帽及防震橡胶圈,轻装轻卸,防止钢瓶以及附件破损。 D.可燃性气体或蒸气的浓度低于下限或高于上限时,都会发生爆炸。 [单项选择]It is possible that the weather of the world may be changing. Some scientists imagine that this could even mean the beginning of another ice age. The effects of such a change in weather on human population of the world would be frightening.
Recent research suggests that the warming trend (倾向)of the past hundred years or so may be coming to an end. During the past ten years, scientists tell us that the temperature of the world has dropped a little. This would have effects on wind and rain in the weather picture. Scientists believe clouds may be an important factor (因素) in changing the amount of heat on the earth. Another possibility is that man’s agriculture and industry ways may affect the natural weather. The temperature of the world in the past ten years has dropped a little______. A. because wind and rain changed the weather B. the drop in the temperature would have effects on wind and rain C. because wind and rain did not change the weather D. the drop in the temperature would not have effects on wind and rain 我来回答: 提交
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