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【单选题】
According to the information given in the passage, which of the following best characterizes the different motivations behind the earliest experiments with gasoline-electric hybrids and the experiments going on in modern times?A.
The earliest experiments with hybrids sought to improve the fuel efficiency of electric engines, while modern experiments seek to improve the performance of gas-burning engines.
B.
The earliest experiments with hybrids sought to improve the fuel efficiency of gas-burning engines, while modern experiments seek to improve the performance of electric engines.
C.
Modern experiments with hybrids seek to improve the fuel efficiency of gas-burning engines, while the earliest experiments sought to improve the performance of electric engines.
D.
Modern experiments with hybrids seek to improve the cruising range of gas-powered cars, while earlier experiments sought to improve the handling and safety of electric cars.
E.
The earliest experiments with hybrids sought to combine the power of steam with the efficiency of electricity, while modern experiments seek to combine the efficiency of electricity with the power of gas.
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皮皮学刷刷变学霸
举一反三
【单选题】关于牛顿第一定律,下列说法中正确的是( )
A.
该定律是通过斜面上小车运动的实验直接得出的结论
B.
该定律是在大量经验事实的基础上，通过科学推理概括出来的
C.
定律不能直接用实验来证明，只是一种猜想
D.
该定律可以直接用实验来证明，因为它是力学的基本定律之一
【多选题】网络需求者的特征有哪些?
A.
注重自我，个性消费回归
B.
需求差异性
C.
消费主动性
D.
消费的参与性，体验性
E.
购买的便利性，趣味性
F.
选择理性化
G.
需求的超前性
【单选题】下列关于β2受体激动剂说法错误的是( )
A.
沙丁胺醇、特布他林为短效药物,可用于急性发作,效果好
B.
沙美特罗属于长效药,属于用于长期预防药,不适用于急性发作
C.
单胺氧化酶抑制剂、三环类抗抑郁药、抗组胺药、镇咳药等作用于窦房结的药物能够增加本类药物的副作用。
D.
药效不稳定,不如茶碱类
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