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患者，女性，28岁。已婚，未生育。现停经50天，有少量阴道流血，无早孕反应。妇科检查：闭，软，双附件（-）。最可能的诊断是A、先兆流产 B、过期流产 C、不全流产 D、难免流产 E、习惯流产 该病例最简单的辅助检查方法是A、B超 B、尿妊娠试验 C、阴道镜检查 D、阴道后穹隆穿刺 E、腹腔镜检查
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【简答题】在如下图所示电路中，变压器内阻及二极管的正向电阻均可忽略不计，变压器二次电压的有效值U 2 =20V，正常工作时测得整流滤波后的平均电压U I =24V，U O =6V，C=100μF，R=400Ω，R L =400Ω。
【简答题】A．Geology. B．Music. C．Medical. D．Mathematics.
【单选题】如图所示电路, 变压器内阻及二极管正向电阻均可忽略不计, 设输出电压平均值 U O ( AV ) = 18V ,则变压器次级电压有效值 U 2 约为多少伏?
A.
18V
B.
20V
C.
15V
D.
24V
【简答题】It is a medical condition that produces an unfavorable reaction to certain foods,insect bites,etc.
【单选题】As the cost of gas and oil for home heating has gone up, many Americans have switched from these fuels to wood for heating their homes. In 1973, approximately 200,000 wood-burning stoves, intended for...
A.
went up fivefold over a six-year period
B.
rose to seven million during the seventies
C.
multiplied thirty-five times between 1973 and the beginning of 1981
D.
increased by 6,000,000 over an eight-year period
【简答题】Section C Directions: 略 11. When did the family car become common in America? In the early _________________. 12. Why do more Americans have to drive to work? Because they have moved out of the ______...
【简答题】( )症状是指能反映疾病临床特征的症状,但这些症状不能确定疾病的性质。
【简答题】A) chemical B) physical C) medical D) mental
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