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单项选择题

i1=10sin(ωt)A；U1=20cos(ωt+30°)]V，电压相量与电流相量的相位差为

A．120°
B．60°
C．90°
D．30°
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单项选择题
一般学前儿童年龄愈小，新陈代谢愈旺盛，每日尿总量也就较多，且膀胱贮尿机能差，加之神经系统对排尿的调节能力差，故排尿的次数也就较多。（ ）
A．对
B．错
单项选择题
A. B. C. D.
单项选择题
Which of the following statements is wrong about Chongqing Underwater Museum of White Crane Ridge?
A、 It was the first underwater museum in China, located in Fuling, Chongqing.
B、 People must go underwater before they can visit this museum.
C、 The regular exposure of the stone ridges also provided the ancient people with the chance to observe and record water levels.
D、 In addition to its scientific value, the ridge inscriptions showcase a collection of works by generations of exceptional calligraphers and authors.
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