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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_____。

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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

男，40岁，急诊人院，神志不清，出冷汗脉搏细数，血压80／45nlmHg，诊断为“急性梗阻性化脓性胆管炎”，其体位应取()

A. 半坐卧位
B. 坐位
C. 头低足高位
D. 头高足低位
E. 任意卧位