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【多选题】
关于电容元件下列说法正确的是( )。A.
功率因素为零
B.
阻抗角为零
C.
阻抗角为-90度。
D.
功率因素为1。
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反馈参考答案：
举一反三
【单选题】Which of the following is NOT tree about the two antagonists?
A.
France was predominant on land.
B.
Britain was predominant at sea.
C.
The only way for France to win was to close all the ports of Europe to British ships.
D.
France set out to overcome Britain by building more warships along their ports.
【简答题】采区回风巷、采掘工作面回风巷风流中瓦斯浓度超过()%或二氧化碳浓度超过()%时，必须停止工作，撤出人员，采取措施，进行处理。
【简答题】Opioid Antagonists and Opioid Agonists/Antagonists阿片受体拮抗剂和阿片样激动/拮抗剂
【单选题】Regarding competitive antagonists, which statements is wrong?
A.
Do not themselves bind to receptors but interfere with the binding of agonists
B.
Bind to receptors but do not stimulate them
C.
Can be overcome by increasing the agonist concentration
D.
Usually bind to receptors for very short periods
E.
Directly destroy the agonists
【单选题】在采区回风巷、采掘工作面回风巷风流中瓦斯浓度超过()或二氧化碳浓度超过1.5%时，必须停止工作，撤出人员，采取措施，进行处理。
A.
0.5%
B.
0.75%
C.
1.0%
D.
1.5%
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