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【单选题】
在一定实验条件下,测得某植物光合作用速率与光照强度之间的关系、细胞呼吸与氧气浓度之间的关系及光合作用速率、细胞呼吸速率与温度之间的关系如下图所示,对图示解释正确的是()
A.
影响图甲中曲线上的A点上下移动的主要外界因素是氧气浓度
B.
图乙中的数据需在适宜光照条件下测量
C.
图丙中两曲线右侧交点对应中B点,B点时影响光合作用速率的主要因素是光照强度
D.
图丙中若大棚设定的温度为两曲线右侧交点处的温度,每日光照必须长于12h植物才能生长
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举一反三
【单选题】锥度的定义是( )。
A.
(大端一小端)/长度
B.
(小端一大端)/长度
C.
大端除以小端的值
D.
小端除以大端的值
【简答题】心室肌细胞一次兴奋过程中,其兴奋性发生的改变可分为(),和()。额外的刺激落在心肌兴奋过程兴奋性变化的()中,不会产生第二个兴奋和收缩。
【单选题】锥度的定义是( )。
A.
(大端-小端)/长度
B.
(小端-大端)/长度
C.
大端除以小端的值
D.
小端除以大端的值
【单选题】Throughout George Bush's presidency, the federal government has refused to support any regulation of the greenhouse gases that cause global warming. Whenever the subject comes up, officials tend to mu...
A.
It is the government's obligation to set up stricter regulation.
B.
It is disappointing for the public that the government shies away this problem.
C.
The government is the only organization that can control greenhouse gases.
D.
The government is not the chief organization authorized to control greenhouse gases.
【单选题】Throughout George Bush's presidency, the federal government has refused to support any regulation of the greenhouse gases that cause global warming. Whenever the subject comes up, officials tend to mu...
A.
It is the government's obligation to set up stricter regulation.
B.
It is disappointing for the public that the government shies away from this problem.
C.
The government is the only organization that can control greenhouse gases.
D.
The government is not the chief organization authorized to control greenhouse gases.
【简答题】Questions 1 to 5 are based on the following passage. Before, whenever we had wealth, we started discussing poverty Why not now? Why is the current politics of wealth and poverty seemingly about wealth...
【单选题】纪录片人工照明设计混合式布光首先要注意什么问题?
A.
重点活动区域布光
B.
色温平衡
C.
选择适合的人造光源
D.
动态人物布光
【单选题】__________ generate(s) prices whenever securities are bought or sold.
A.
Financial markets
B.
Financial institutions
C.
The Federal Reserve
D.
The Securities and Exchange Commission
【单选题】Whenever the federal government spends more than it receives in tax revenue, then by definition it
A.
runs a budget surplus.
B.
operates a balanced budget.
C.
runs a budget deficit.
D.
increases economic growth.
【单选题】Throughout George Bush's presidency, the federal government has refused to support any regulation of the greenhouse gases that cause global warming. Whenever the subject comes up, officials tend to mu...
A.
It is the government's obligation to set up stricter regulation.
B.
It is disappointing for the public that the government shies away from this problem.
C.
The government is the only organization that can control greenhouse gases.
D.
The government is not the chief organization authorized to control greenhouse gases.
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