题目内容

2019年4月25日至27日，第二届“一带一路”国际合作高峰论坛在北京召开，习近平发表主旨演讲。他指出，中国扩大开放的举措，是根据中国改革发展客观需要作出的自主选择，这有利于（）。

A. 推动经济高质量发展
B. 满足人民对美好生活的向往
C. 推进多边贸易繁荣发展
D. 世界和平、稳定、发展

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中国科协日前发布报告显示，截至2018年底，我国科技人力资源总量达10154.5万人，规模继续保持_____。

Most amplifiers can be classified in by their function. If the output signal is larger in voltage amplitude than the input signal, the amplifier is a (). If there is no voltage gain, but the output power is greater than the input power, the amplifier is a power amplifier.

A. voltage amplifier
B. power amplifier
C. transistor amplifier
D. operational amplifier

In the common-emitter amplifier circuit, the base terminal of the transistor serves as the input, the collector is the output, and the () is common to both.

A. substrate
B. collector
C. emitter
D. base

In a non-inverting amplifier circuit, if the op-amp has an open-loop gain of 200000, the input voltage Vin = 1.5 volts, the inverting input resistor R1=10 kilo-ohms，the feedback resistor R2=0 ohms, then the output voltage can be calculated by using the formula. The output voltage Vout = () volts.

A. 300000
B. 0
C. 1.5
D. unstable