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【判断题】
钢和生铁都是铁碳合金。其中,碳的质量分数wc小于0.77%的称为例,碳的质量分数大于2.11%的称为生铁。( )A.
正确
B.
错误
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举一反三
【单选题】大中型商业保险购买者明显不同于小型商业保险消费者（包括个人保险购买者），下列选项中属于大中型商业保险购买者特征的是（）。
A.
往往需要适合其特殊需要的保险保障计划而非传统的定式保险合同
B.
在无充分保险的情况下对损失的承受能力非常有限
C.
他们往往处于单一场所
D.
大多数人视保险为一种商品
【单选题】This passage mainly discusses ______.
A.
the functions of carbon dioxide and water
B.
the role of water in a growing plant
C.
the process of simple sugar formation
D.
the synthesis of water with carbon dioxide
【单选题】This passage is mainly about ______.
A.
the functions of carbon dioxide and water
B.
the role of water in a growing plant
C.
the process of simple sugar formation
D.
the synthesis of water with carbon dioxide
【单选题】Oxygen and carbon dioxide cross the respiratory membrane by the process of:
A.
counter-current exchange
B.
diffusion
C.
active transport
D.
oxygen – carbon dioxide pump
【单选题】The passage suggests that the effects of volcanic carbon dioxide on the environment differ from those of sulfurous gases in that
A.
carbon dioxide tends to alleviate environmental haze, while sulfurous gases usually increase it
B.
carbon dioxide tends to increase temperatures by trapping sunlight, while sulfurous gases tend to decrease temperatures by blocking it
C.
carbon dioxide tends to have an effect on the environment, while sulfurous gases for the most part do not
D.
sulfurous gases have played an even more significant role than carbon dioxide in pushing environmental temperatures outside the habitable range
E.
sulfurous gases tend to decrease the level of solar radiation outside the earth's atmosphere, while carbon dioxide plays only a negligible role
【多选题】温度 对花卉的花芽分化 有很大的影响。每一种花卉在不同的生长发育期对 温度 有不同的要求。 下列( )花卉是在高温下进行花芽分化的。
A.
金光菊
B.
八仙花
C.
中华紫菀
D.
郁金香
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